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Honda K, Hasegawa K, Ban M, Yano Y, Ogura Y. Massive stocking of chum salmon (Oncorhynchus keta) fry fattens non-native brown trout (Salmo trutta) in Hokkaido, Japan. PLoS One 2024; 19:e0307552. [PMID: 39028744 PMCID: PMC11259280 DOI: 10.1371/journal.pone.0307552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Accepted: 07/08/2024] [Indexed: 07/21/2024] Open
Abstract
In Japan, stocked chum salmon (Oncorhynchus keta) fry may have become the perfect prey for non-native brown trout (Salmo trutta), which are popular targets of anglers. If this is the case, fry stocking which is intended to boost commercial fishing may be helping to sustain the populations of an invasive predator. We used dietary and biochemical analyses to examine whether brown trout quickly restore their nutritional status following wintertime declines by preying upon chum salmon fry that are stocked in spring. We targeted six rivers in Hokkaido, Japan, three with fry stocking and three without. Changes in brown trout condition factor, triglyceride contents in muscle and serum, serum insulin-like growth factor-1 (IGF-1; an indicator of short-term growth), and docosahexaenoic acid (DHA; an essential fatty acid abundant in fish) content in muscle were examined between before stocking and during the stocking period in the six rivers. Dietary analysis showed that brown trout preyed on fry during the stocking period in all stocked rivers. Their nutritional status tended to be higher during the stocking period than before stocking in stocked rivers, but not in unstocked rivers. These results suggest that the massive stocking of chum salmon fry provides brown trout with the perfect prey to quickly restore their nutritional status and fuel increased growth; this may therefore be a controversial issue among stakeholders.
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Affiliation(s)
- Kentaro Honda
- Salmon Research Department, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Sapporo, Hokkaido, Japan
| | - Koh Hasegawa
- Salmon Research Department, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Sapporo, Hokkaido, Japan
| | - Masatoshi Ban
- Salmon Research Department, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Sapporo, Hokkaido, Japan
| | - Yutaka Yano
- Salmon Research Department, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Sapporo, Hokkaido, Japan
| | - Yuhei Ogura
- Salmon Research Department, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Sapporo, Hokkaido, Japan
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2
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Poissant D, Coomes OT, Robinson BE, Vargas Dávila G. Fishers' ecological knowledge points to fishing-induced changes in the Peruvian Amazon. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2024; 34:e2964. [PMID: 38842210 DOI: 10.1002/eap.2964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 07/30/2023] [Accepted: 11/15/2023] [Indexed: 06/07/2024]
Abstract
Scientists increasingly draw on fishers' ecological knowledge (FEK) to gain a better understanding of fish biology and ecology, and inform options for fisheries management. We report on a study of FEK among fishers along the Lower Ucayali River in Peru, a region of exceptional productivity and diversity, which is also a major supplier of fish to the largest city in the Peruvian Amazon. Given a lack of available scientific information on stock status, we sought to identify temporal changes in the composition and size of exploited species by interviewing fishers from 18 communities who vary in years of fishing experience since the mid-1950s. We develop four FEK-based indicators to assess changes in the fish assemblage and compare findings with landings data. We find an intensification of fishing gear deployed over time and spatiotemporal shifts in the fish assemblage and reported declines in species weight, which point to a fishing-down process with declines across multiple species. This finding is reflected in a shifting baseline among our participants, whereby younger generations of fishers have different expectations regarding the distribution and size of species. Our study points to the importance of spillover effects from the nearby Pacaya-Samira National Reserve and community initiatives to support the regional fishery. Reference to fishers' knowledge also suggests that species decline is likely underreported in aggregated landings data. Despite the dynamism and diversity of Amazonian floodplain fisheries, simple FEK-based indicators can provide useful information for understanding fishing-induced changes in the fish assemblage. Fishers hold valuable knowledge for fishery management and conservation initiatives in the region.
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Affiliation(s)
- David Poissant
- Department of Geography, McGill University, Montreal, Quebec, Canada
| | - Oliver T Coomes
- Department of Geography, McGill University, Montreal, Quebec, Canada
| | - Brian E Robinson
- Department of Geography, McGill University, Montreal, Quebec, Canada
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3
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Lynch AJ, Embke HS, Nyboer EA, Wood LE, Thorpe A, Phang SC, Viana DF, Golden CD, Milardi M, Arlinghaus R, Baigun C, Beard TD, Cooke SJ, Cowx IG, Koehn JD, Lyach R, Potts W, Robertson AM, Schmidhuber J, Weyl OLF. Inland recreational fisheries contribute nutritional benefits and economic value but are vulnerable to climate change. NATURE FOOD 2024; 5:433-443. [PMID: 38741002 DOI: 10.1038/s43016-024-00961-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Accepted: 03/12/2024] [Indexed: 05/16/2024]
Abstract
Inland recreational fishing is primarily considered a leisure-driven activity in freshwaters, yet its harvest can contribute to food systems. Here we estimate that the harvest from inland recreational fishing equates to just over one-tenth of all reported inland fisheries catch globally. The estimated total consumptive use value of inland recreational fish destined for human consumption may reach US$9.95 billion annually. We identify Austria, Canada, Germany and Slovakia as countries above the third quantile for nutrition, economic value and climate vulnerability. These results have important implications for populations dependent on inland recreational fishing for food. Our findings can inform climate adaptation planning for inland recreational fisheries, particularly those not currently managed as food fisheries.
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Affiliation(s)
- Abigail J Lynch
- National Climate Adaptation Science Center, United States Geological Survey, Reston, VA, USA.
| | - Holly S Embke
- Midwest Climate Adaptation Science Center, United States Geological Survey, St. Paul, MN, USA
| | - Elizabeth A Nyboer
- Canadian Centre for Evidence-Based Conservation, Department of Biology and Institute of Environmental and Interdisciplinary Science, Carleton University, Ottawa, Ontario, Canada
- Department of Fish and Wildlife Conservation, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA
| | - Louisa E Wood
- Centre for Blue Governance, University of Portsmouth, Portsmouth, UK
| | - Andy Thorpe
- Centre for Blue Governance, University of Portsmouth, Portsmouth, UK
| | | | - Daniel F Viana
- Department of Nutrition, Department of Environmental Health, Department of Global Health and Population, Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - Christopher D Golden
- Department of Nutrition, Department of Environmental Health, Department of Global Health and Population, Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - Marco Milardi
- Southern Indian Ocean Fisheries Agreement (SIOFA/APSOI), Saint-Denis, France
| | - Robert Arlinghaus
- Department of Fish Biology, Fisheries and Aquaculture, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany
- Division of Integrative Fisheries Management, Faculty of Life Sciences, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Claudio Baigun
- Institute of Environmental Research and Engineering, National University of San Martin-CONICET, Buenos Aires, Argentina
| | - T Douglas Beard
- National Climate Adaptation Science Center, United States Geological Survey, Reston, VA, USA
| | - Steven J Cooke
- Canadian Centre for Evidence-Based Conservation, Department of Biology and Institute of Environmental and Interdisciplinary Science, Carleton University, Ottawa, Ontario, Canada
| | - Ian G Cowx
- International Fisheries Institute, University of Hull, Hull, UK
| | - John D Koehn
- Applied Aquatic Ecology, Arthur Rylah Institute for Environmental Research, Department of Energy, Environment and Climate Action, Heidelberg, Victoria, Australia
- Gulbali Institute for Agriculture, Water and Environment, Charles Sturt University, Albury, New South Wales, Australia
| | - Roman Lyach
- Institute for Evaluations and Social Analyses (INESAN), Prague, Czech Republic
| | - Warren Potts
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda, South Africa
- South African Institute for Aquatic Biodiversity, Makhanda, South Africa
| | - Ashley M Robertson
- Department of Environmental Science and Policy, George Mason University, Fairfax, VA, USA
| | | | - Olaf L F Weyl
- South African Institute for Aquatic Biodiversity, Makhanda, South Africa
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Abdelhady AA, Samy-Kamal M, Abdel-Raheem KHM, Ahmed MS, Khalil MM. Historical changes in fish landings indicate a significant shift in fish catch composition and biodiversity loss in the Nile-Delta lakes. MARINE POLLUTION BULLETIN 2023; 194:115368. [PMID: 37572433 DOI: 10.1016/j.marpolbul.2023.115368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2023] [Revised: 07/30/2023] [Accepted: 07/31/2023] [Indexed: 08/14/2023]
Abstract
To monitor the changes in fish biodiversity and to elucidate the factors responsible for these changes, the landings composition (LC) over the past 30 years in the Nile-Delta lakes was quantitatively analyzed. The LC data indicates a shift in target species towards demersal opportunistic species. A significant difference (P < 0.001) between two main intervals highlighted in both PERMANOVA and PCA plot; the first interval (1991-2002) is dominated by Tilapia and rare species, while the second interval (2003-2020) is dominated by the opportunistic catfish and mullet species. Noticeable declines in species richness and landings of rare species were observed, where rare taxa either have been overexploited or they may be positively affected by increasing pollution levels than do other dominated species such as Tilapia. In contrast, opportunistic fish species such as catfish and mullet, have flourished in such polluted water due to their ability to tolerate seasonal pollution-related hypoxia.
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Affiliation(s)
- Ahmed A Abdelhady
- Geology Department, Faculty of Science, Minia University, 61519 El-Minia, Egypt.
| | - Mohamed Samy-Kamal
- Departamento de Ciencias del Mar y Biología Aplicada, Universidad de Alicante, Edificio Ciencias V, Campus de San Vicente del Raspeig, PO Box 99, 03080 Alicante, Spain
| | | | - Mohamed S Ahmed
- Geology and Geophysics Department, College of Science, King Saud University 2455, Riyadh 11451, Saudi Arabia
| | - Mahmoud M Khalil
- Geology Department, Faculty of Science, Minia University, 61519 El-Minia, Egypt
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Wubie A, Teshome K, Tesfaye G. Potential fish yield and biology of some fish in Lake Hertale, Afar regional state, Ethiopia. Heliyon 2023; 9:e18661. [PMID: 37593637 PMCID: PMC10428036 DOI: 10.1016/j.heliyon.2023.e18661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 07/11/2023] [Accepted: 07/24/2023] [Indexed: 08/19/2023] Open
Abstract
The Afar region is characterized by an arid and semi-arid climate with erratic rainfall and is prone to frequent droughts despite being endowed with fresh and saline water bodies along the Awash River Basin. Lake Hertale is one of those fresh water bodies located in the middle of the Awash River Valley. The lake's fishery is presumed not to have been exploited before. The study attempted to describe some physico-chemical parameters, fish species composition, estimate production potential which are relevant to develop a lake fishery with the prospect of contributing to food and nutrition security. The nutrient and chlorphyl-a measurements indicated eutrophic state but with apparently comparative low primary biomass. Conductivity, dissolved oxygen and temperature were within the optimal range for warm water species along with slightly alkaline pH. It was found that Lake Hertale is home to four important fish species, namely, Nile Tilapia (Oreochromis niloticus), barbs (Lebobarbus intermidus), African catfish (Clarias gariepinus) and Common carp (Cyprinus carpio), Nile crocodiles, several species of birds and hippopotamus. Labeobarbus constituted 56%, followed by Nile tilapia with 31% of the total population. The African Catfish constituted only 9% of the catch. The mean lengths of African Catfish and Labeobarbus were 47.2 and 38 cm respectively. The mean lengths of Nile tilapia and Common carp were 22.8 and 21.7 cm respectively. The fish production potential of the lake was estimated from 94.3 to 238 tons per year, with an average production of 145.7 tons per year. The estimate production potential can support up to 21 to 28 fishers, with an average number of 25 fishermen to sustainably utilize the lake's fishery potential. Lake Hertale and other adjacent lakes in the Afar region of Ethiopia can complement to the fight against hunger and malnutrition. Besides, through appropriate fishery development intervention, it is possible to create employment for the predominantly pastoralist Afar community.
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Affiliation(s)
- Alemayehu Wubie
- Ethiopian Institute of Agricultural Research (EIAR), National Fishery and Other Aquatic Life Research Center, P.O. Box-64, Sebeta, Ethiopia
| | - Kibru Teshome
- Ethiopian Institute of Agricultural Research (EIAR), National Fishery and Other Aquatic Life Research Center, P.O. Box-64, Sebeta, Ethiopia
| | - Gashaw Tesfaye
- Ethiopian Institute of Agricultural Research (EIAR), National Fishery and Other Aquatic Life Research Center, P.O. Box-64, Sebeta, Ethiopia
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Plasma activated water offers food security opportunities by increasing shelf life of freshwater fisheries products in South Africa. Food Secur 2023. [DOI: 10.1007/s12571-022-01334-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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7
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Bănăduc D, Simić V, Cianfaglione K, Barinova S, Afanasyev S, Öktener A, McCall G, Simić S, Curtean-Bănăduc A. Freshwater as a Sustainable Resource and Generator of Secondary Resources in the 21st Century: Stressors, Threats, Risks, Management and Protection Strategies, and Conservation Approaches. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:16570. [PMID: 36554449 PMCID: PMC9779543 DOI: 10.3390/ijerph192416570] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 12/01/2022] [Accepted: 12/06/2022] [Indexed: 06/17/2023]
Abstract
This paper is a synthetic overview of some of the threats, risks, and integrated water management elements in freshwater ecosystems. The paper provides some discussion of human needs and water conservation issues related to freshwater systems: (1) introduction and background; (2) water basics and natural cycles; (3) freshwater roles in human cultures and civilizations; (4) water as a biosphere cornerstone; (5) climate as a hydrospheric 'game changer' from the perspective of freshwater; (6) human-induced stressors' effects on freshwater ecosystem changes (pollution, habitat fragmentation, etc.); (7) freshwater ecosystems' biological resources in the context of unsustainable exploitation/overexploitation; (8) invasive species, parasites, and diseases in freshwater systems; (9) freshwater ecosystems' vegetation; (10) the relationship between human warfare and water. All of these issues and more create an extremely complex matrix of stressors that plays a driving role in changing freshwater ecosystems both qualitatively and quantitatively, as well as their capacity to offer sustainable products and services to human societies. Only internationally integrated policies, strategies, assessment, monitoring, management, protection, and conservation initiatives can diminish and hopefully stop the long-term deterioration of Earth's freshwater resources and their associated secondary resources.
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Affiliation(s)
- Doru Bănăduc
- Applied Ecology Research Center, Faculty of Sciences, Lucian Blaga University of Sibiu, I. Raţiu Street 5–7, 9, 550012 Sibiu, Romania
| | - Vladica Simić
- Department of Biology and Ecology, Faculty of Science, University of Kragujevac, R. Domanovića 12, 34000 Kragujevac, Serbia
| | | | - Sophia Barinova
- Institute of Evolution, University of Haifa, Mount Carmel, 199 Abba Khoushi Avenue, Haifa 3498838, Israel
| | - Sergey Afanasyev
- Institute of Hydrobiology National Academy of Sciences of Ukraine, Prospect Geroiv Stalingradu 12, 04210 Kyiv, Ukraine
| | - Ahmet Öktener
- Ministry of Food, Agriculture and Livestock, Food Control Laboratory Directorate, Denizli 20010, Turkey
| | - Grant McCall
- Center for Human-Environmental Research (CHER), New Orleans, LA 70118, USA
| | - Snežana Simić
- Department of Biology and Ecology, Faculty of Science, University of Kragujevac, R. Domanovića 12, 34000 Kragujevac, Serbia
| | - Angela Curtean-Bănăduc
- Applied Ecology Research Center, Faculty of Sciences, Lucian Blaga University of Sibiu, I. Raţiu Street 5–7, 9, 550012 Sibiu, Romania
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Nyboer EA, Musinguzi L, Ogutu‐Ohwayo R, Natugonza V, Cooke SJ, Young N, Chapman LJ. Climate change adaptation and adaptive efficacy in the inland fisheries of the Lake Victoria basin. PEOPLE AND NATURE 2022. [DOI: 10.1002/pan3.10388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
| | - Laban Musinguzi
- National Fisheries Resources Research Institute (NaFIRRI) Jinja Uganda
| | | | - Vianny Natugonza
- Busitema University Maritime Institute Namasagali campus Kamuli Uganda
| | - Steven J. Cooke
- Department of Biology and Institute for Environment and Interdisciplinary Science Carleton University Ottawa Ontario Canada
| | - Nathan Young
- School of Sociological and Anthropological Studies University of Ottawa Ottawa Ontario Canada
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Benoit DM, Chu C, Giacomini HC, Jackson DA. Size spectrum model reveals importance of considering species interactions in a freshwater fisheries management context. Ecosphere 2022. [DOI: 10.1002/ecs2.4163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- David M. Benoit
- Department of Ecology and Evolutionary Biology University of Toronto Toronto Ontario Canada
| | - Cindy Chu
- Department of Ecology and Evolutionary Biology University of Toronto Toronto Ontario Canada
- Great Lakes Laboratory for Fisheries and Aquatic Sciences Fisheries and Oceans Canada Burlington Ontario Canada
| | - Henrique C. Giacomini
- Ontario Ministry of Northern Development, Mines, Natural Resources, and Forestry Aquatic Research and Monitoring Section Peterborough Ontario Canada
| | - Donald A. Jackson
- Department of Ecology and Evolutionary Biology University of Toronto Toronto Ontario Canada
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Chakona A, Jordaan MS, Raimondo DC, Bills RI, Skelton PH, van der Colff D. Diversity, distribution and extinction risk of native freshwater fishes of South Africa. JOURNAL OF FISH BIOLOGY 2022; 100:1044-1061. [PMID: 35170047 DOI: 10.1111/jfb.15011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 12/08/2021] [Accepted: 02/13/2022] [Indexed: 06/14/2023]
Abstract
Extinction risk for 101 valid species and 18 unique genetic lineages of native freshwater fishes of South Africa was assessed in 2016 following the IUCN Red List criteria. An additional five species (three new species that were described and two species that were revalidated subsequent to the 2016 assessments) were assessed in the present study. A synthesis of the outcome of the assessments of the 106 valid species and 18 genetic lineages indicates that 45 (36%) of South Africa's freshwater fish taxa are threatened (7 Critically Endangered, 25 Endangered, 13 Vulnerable). Of the remaining taxa, 17 (14%) are listed as Near Threatened, 57 (46%) are Least Concern and five (4%) are Data Deficient. More than 60% of the endemic taxa are threatened. The Cape Fold Ecoregion has the highest proportion of threatened taxa (67%) due to the existence of a unique assemblage of narrow-range endemic species. Galaxias and Pseudobarbus have the highest number of highly threatened taxa as most of the species and lineages in these genera are classified as either CR or EN. Major threats to the native freshwater fishes of the country are invasive fish species, deterioration of water quality, impoundments and excessive water abstraction, land use changes and modification of riverine habitats. Immediate conservation efforts should focus on securing remnant populations of highly threatened taxa and preventing deterioration in threat status, because recovery is rare. Accurate delimitation of species boundaries, mapping their distribution ranges, improved knowledge of pressures and long-term monitoring of population trends need to be prioritised to generate credible data for the 2026 IUCN threat status assessments and designation of important fish areas as part of the National Freshwater Ecosystem Priority Areas (NFEPA) initiative.
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Affiliation(s)
- Albert Chakona
- NRF-South African Institute for Aquatic Biodiversity (NRF-SAIAB), Makhanda (Grahamstown), South Africa
- Department of Ichthyology and Fisheries Science, Rhodes University, Makhanda (Grahamstown), South Africa
| | - Martine S Jordaan
- NRF-South African Institute for Aquatic Biodiversity (NRF-SAIAB), Makhanda (Grahamstown), South Africa
- CapeNature Biodiversity Capabilities Unit, Stellenbosch
- Center of Excellence for Invasion Biology, CapeNature Biodiversity Capabilities Unit, Stellenbosch
| | - Domitilla C Raimondo
- South African National Biodiversity Institute Threatened Species Program, Kirstenbosch National Botanical Gardens, Cape Town
| | - Roger I Bills
- NRF-South African Institute for Aquatic Biodiversity (NRF-SAIAB), Makhanda (Grahamstown), South Africa
| | - Paul H Skelton
- NRF-South African Institute for Aquatic Biodiversity (NRF-SAIAB), Makhanda (Grahamstown), South Africa
| | - Dewidine van der Colff
- Center of Excellence for Invasion Biology, CapeNature Biodiversity Capabilities Unit, Stellenbosch
- South African National Biodiversity Institute Threatened Species Program, Kirstenbosch National Botanical Gardens, Cape Town
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Flood-Pulse Variability and Climate Change Effects Increase Uncertainty in Fish Yields: Revisiting Narratives of Declining Fish Catches in India’s Ganga River. HYDROLOGY 2022. [DOI: 10.3390/hydrology9040053] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
River-floodplains support a significant number of small-scale capture fisheries despite having undergone degradation due to human modification of river flows by dams, pollution, and climate change. River fish production is underpinned by the annual flood-pulse and associated environmental changes that act as cues for spawning and dispersal for most species. However, studies on fish stock declines have focused more on overfishing than on hydroclimatic variability. Therefore, understanding how changes in flood-pulse variability influence fishing effort and yields is critical to inform adaptive fisheries’ management. We investigated hydroclimatic factors driving flood-pulse variability and fish catch–effort dynamics in India’s Ganga River over two decades (2000–2020). We compiled fishers’ narratives of changing fish catches through semi-structured interviews to compare them with our observed trends. Flood amplitude showed increasing variability, longer duration, and earlier rise timings, linked to La Niña and El Niño phases. Catches per unit effort were correlated with total yield and effort but did not decline as fishers thought, despite overall declines in yield over time. Hydroclimatic variability was a more significant driver of changing yields than local fishing pressure. Rising uncertainty in fisheries’ production, in response to increasing flood-pulse variability and altered flows in the Gangetic Plains, may be affecting fishing behaviour and underlying resource conflicts.
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12
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Application of DPSIR and Tobit Models in Assessing Freshwater Ecosystems: The Case of Lake Malombe, Malawi. WATER 2022. [DOI: 10.3390/w14040619] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Inland freshwater shallow lake ecosystem degradation is indistinctly intertwined with human-induced factors and climate variability. Changes in climate and human-induced factors significantly influence the state of lake ecosystems. This study provides evidence of the driver, pressure, state, impact, and response (DPSIR) indicators for freshwater lake ecosystem dynamics, taking Lake Malombe in Malawi as a case study. We used the DPSIR framework and Tobit model to achieve the study’s objectives. The study’s findings indicate that top-down processes gradually erode Lake Malombe’s ecosystem state. The lake resilience is falling away from its natural state due to increasing rates of drivers, pressures, and impacts, indicating the lake ecosystem’s deterioration. The study shows that demographic, socio–economic, climatic drivers, pressures, state, and responses significantly (p < 0.05) influenced the lake ecosystem’s resilience. The study suggests that substantial freshwater ecosystem management under the current scenario requires a long-term, robust, and sustainable management plan. The findings from this study provide a roadmap for short-term and long-term practical policy-focused responses, particularly in implementing a freshwater ecosystem restoration programs in Malawi and Africa more broadly.
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Silva MRO, Silva AB, Barbosa JC, Amaral C, Lopes PFM. Empowering fisherwomen leaders helped reduce the effects of the COVID-19 pandemic on fishing communities: Insights from Brazil. MARINE POLICY 2022; 135:104842. [PMID: 34732972 PMCID: PMC8554008 DOI: 10.1016/j.marpol.2021.104842] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Revised: 10/11/2021] [Accepted: 10/24/2021] [Indexed: 05/07/2023]
Abstract
Small-scale fishers in the developing world have been particularly affected by the COVID-19 pandemic given that they belong to one of the most socioeconomically vulnerable groups. In Brazil, one of the countries most affected by the pandemic, it was expected early on that the economy and wellbeing of fishers would be negatively impacted, yet fishers were expected to show some adaptive and coping mechanisms. To assess whether this was the case, 40 fishers, who are also leaders of fishing associations representing over 80 thousand fishers throughout the country, were interviewed. Results revealed that female leaders appraised the economic and health / wellbeing impacts to be harsher on fishers than men did. Moreover, fishers on the coast were found to be better able to adapt than those inland, although both had low levels of adaptive capacity. The nature of coping and adaptive mechanisms was also found to be different between locations. Whereas leaders from coastal associations stated that most of the adaptive responses occurred in the post-harvest sector (e.g., changes to the types of sales and changes to supply chain actors), leaders from inland communities stated that the changes that occurred related specifically to fishing (e.g., decrease in effort and changes in fishing grounds). These findings suggest that: 1) women may be better prepared to respond to COVID-19 because their appraisal may be more realistic than men, 2) the historic vulnerability of fishing communities may limit their adaptative capacity, and 3) coastal fishers have likely found ways to maintain part of their trade, contrary to inland fishers. Thus, to better help small-scale fisheries to cope with this particular pandemic or other large disruptive impacts, it would be recommended to invest in women in leadership roles while also guaranteeing that fishers have the minimal conditions to cope with and adapt to impacts. The latter can be done by assuring emergency cash transfers for the duration of the impact, as with the still ongoing pandemic, and investing in building fisher resilience for future shocks.
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Affiliation(s)
- Monalisa R O Silva
- Fishing ecology, management, and economics group, Department of Ecology, Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil
| | - André B Silva
- Graduate Program in Development and Environment, Universidade Federal do Piauí, Teresina, Brazil
| | - Jaciana C Barbosa
- Graduate Program in Development and Environment, Universidade Federal do Rio Grande do Norte, Natal, Brazil
| | - Cássia Amaral
- Fishing ecology, management, and economics group, Department of Ecology, Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil
| | - Priscila F M Lopes
- Fishing ecology, management, and economics group, Department of Ecology, Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil
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14
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Moreau MA, Garaway CJ. Trading Fast and Slow: Fish Marketing Networks Provide Flexible Livelihood Opportunities on an East African Floodplain. FRONTIERS IN SUSTAINABLE FOOD SYSTEMS 2021. [DOI: 10.3389/fsufs.2021.742803] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Domestic marketing networks in inland small-scale fisheries (SSF) provide food and income to millions of the rural poor globally. Yet these contributions remain undervalued, as most trade is informal and unmonitored, and inland fisheries overlooked in research and policy. Taking a commodity chain approach, we provide a case study of access arrangements governing how people come to enter and benefit from the freshwater fish trade on Tanzania's Rufiji River floodplain. We conducted a repeat market survey, interviews, and participant observation with actors at all levels of the district trade over 15 months. Gender, age, and social capital structured participation patterns, with younger men dominating the more lucrative but riskier fresh trade, older men prioritizing steady income from smoked fish, and women culturally constrained to selling a “cooked” product (i.e., fried fish). Nearly all participants were local, with traders drawing on a complex web of relationships to secure supplies. The majority of market vendors cited the trade as their household's most important income source, with women's earnings and consumption of unsold fish likely to have substantial benefits for children's well-being. Our findings reveal a resilient and pro-poor trade system where, starting with small initial investments, people overcame considerable environmental, financial, regulatory, and infrastructural challenges to reliably deliver fish to rural and urban consumers. Preserving the ecological integrity of Rufiji wetlands in the face of hydro-power development and climate change should be a priority to safeguard the livelihoods and well-being of local inhabitants.
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15
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Stokes GL, Lynch AJ, Funge-Smith S, Valbo-Jørgensen J, Beard TD, Lowe BS, Wong JP, Smidt SJ. A global dataset of inland fisheries expert knowledge. Sci Data 2021; 8:182. [PMID: 34272376 PMCID: PMC8285391 DOI: 10.1038/s41597-021-00949-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Accepted: 05/13/2021] [Indexed: 11/09/2022] Open
Abstract
Inland fisheries and their freshwater habitats face intensifying effects from multiple natural and anthropogenic pressures. Fish harvest and biodiversity data remain largely disparate and severely deficient in many areas, which makes assessing and managing inland fisheries difficult. Expert knowledge is increasingly used to improve and inform biological or vulnerability assessments, especially in data-poor areas. Integrating expert knowledge on the distribution, intensity, and relative influence of human activities can guide natural resource management strategies and institutional resource allocation and prioritization. This paper introduces a dataset summarizing the expert-perceived state of inland fisheries at the basin (fishery) level. An electronic survey distributed to professional networks (June-September 2020) captured expert perceptions (n = 536) of threats, successes, and adaptive capacity to fisheries across 93 hydrological basins, 79 countries, and all major freshwater habitat types. This dataset can be used to address research questions with conservation relevance, including: demographic influences on perceptions of threat, adaptive capacities for climate change, external factors driving multi-stressor interactions, and geospatial threat assessments. Measurement(s) | Perception • Threats • Adaptive capacity | Technology Type(s) | Survey | Factor Type(s) | Fishery location • Demographics | Sample Characteristic - Organism | Homo sapiens • fish | Sample Characteristic - Environment | freshwater environment • lake • stream • wetland ecosystem | Sample Characteristic - Location | Europe • Asia • Oceania • Africa • South America • North America • Australia |
Machine-accessible metadata file describing the reported data: 10.6084/m9.figshare.14749161
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Affiliation(s)
- Gretchen L Stokes
- School of Natural Resources and Environment, University of Florida, Gainesville, FL, 32611, USA.
| | - Abigail J Lynch
- U.S. Geological Survey, National Climate Adaptation Science Center, Reston, VA, 20192, USA
| | - Simon Funge-Smith
- Regional Office for Asia and the Pacific, Food and Agriculture Organization of the United Nations, Bangkok, 10900, Thailand
| | - John Valbo-Jørgensen
- Fisheries Division, Food and Agriculture Organization of the United Nations, Rome, 00153, Italy
| | - T Douglas Beard
- U.S. Geological Survey, National Climate Adaptation Science Center, Reston, VA, 20192, USA
| | - Benjamin S Lowe
- School of Natural Resources and Environment, University of Florida, Gainesville, FL, 32611, USA
| | - Jesse P Wong
- Department of Environmental Science and Policy, George Mason University, Fairfax, VA, 22030, USA
| | - Samuel J Smidt
- Soil and Water Sciences Department, University of Florida, Gainesville, FL, 32611, USA
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16
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Medeiros-Leal WM, Castello L, Freitas CEC, Siqueira-Souza FK. Single-Species Co-management Improves Fish Assemblage Structure and Composition in a Tropical River. Front Ecol Evol 2021. [DOI: 10.3389/fevo.2021.604170] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Co-management is increasingly recognized as an effective model for managing fisheries, but little information exists on whether co-management can produce effects in species other than the target species. Fishery co-management in the tropics, where fish diversity is high and fish catches tend to be multispecies, is prone to produce assemblage-wide effects via alterations in the food web and changes in the overall capture of non-target species. Here, we assessed the effects of co-management for the species Arapaima sp. in relation to the structure and composition of the overall fish assemblage in floodplain lakes of the central Amazon Basin. These floodplain lakes are managed under a system of zoning of fishing activities. We used data from surveys of six floodplain lakes, including two lakes of each of three categories (lakes where fishing is prohibited, limited-access lakes, and open fishing lakes). The surveys were carried out before and after implementation of co-management, through gillnet fishing. The study area was the lower Solimões River, in the Amazon Basin, Brazil. Statistical models showed significant changes in the composition and structure of the fish assemblages after the implementation of the co-management, regardless of the zoning category. Through regulation of gear use and fishing practices, co-management allowed the colonization of species that had not been present before, which lead to higher richness and consequently increased fish sizes, abundance and biomass. Species of sedentary habits, migrants of short and medium distances, with commercial importance benefited the most from co-management. In the results presented in temporal scale, it was possible to observe a potential spillover effect being provided by the lakes where fishing is prohibited (no-take zones) and those of limited access that benefited those open to fishing. Thus, co-management had positive effects in the structure and composition of fish assemblages in all lakes, regardless of zoning category.
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17
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Scientific Methods to Understand Fish Population Dynamics and Support Sustainable Fisheries Management. WATER 2021. [DOI: 10.3390/w13040574] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Fisheries play a significant role in the livelihoods of the world population, while the dependence on fisheries is acute in developing countries. Fisheries are consequently a critical element for meeting the sustainable development (SDG) and FAO goals to reduce poverty, hunger and improve health and well-being. However, 90% of global marine fish stocks are fully or over-exploited. The amount of biologically unsustainable stocks increased from 10% in 1975 to 33% in 2015. Freshwater ecosystems are the most endangered ecosystems and freshwater fish stocks are worldwide in a state of crisis. The continuous fish stock decline indicates that the world is still far from achieving SDG 14 (Life Below Water), FAO’s Blue Growth Initiative goal and SDG 15 (Life on Land, including freshwater systems). Failure to effectively manage world fish stocks can have disastrous effects on biodiversity and the livelihoods and socio-economic conditions of millions of people. Therefore, management strategies that successfully conserve the stocks and provide optimal sustainable yields are urgently needed. However, successful management is only possible when the necessary data are obtained and decision-makers are well informed. The main problem for the management of fisheries, particularly in developing countries, is the lack of information on the past and current status of the fish stocks. Sound data collection and validation methods are, therefore, important. Stock assessment models, which support sustainable fisheries, require life history traits as input parameters. In order to provide accurate estimates of these life history traits, standardized methods for otolith preparation and validation of the rate of growth zone deposition are essential. This review aims to assist researchers and fisheries managers, working on marine and freshwater fish species, in understanding concepts and processes related to stock assessment and population dynamics. Although most examples and case studies originate from developing countries in the African continent, the review remains of great value to many other countries.
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18
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Heino J, Alahuhta J, Bini LM, Cai Y, Heiskanen AS, Hellsten S, Kortelainen P, Kotamäki N, Tolonen KT, Vihervaara P, Vilmi A, Angeler DG. Lakes in the era of global change: moving beyond single-lake thinking in maintaining biodiversity and ecosystem services. Biol Rev Camb Philos Soc 2021; 96:89-106. [PMID: 32869448 DOI: 10.1111/brv.12647] [Citation(s) in RCA: 62] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 08/17/2020] [Accepted: 08/19/2020] [Indexed: 12/25/2022]
Abstract
The Anthropocene presents formidable threats to freshwater ecosystems. Lakes are especially vulnerable and important at the same time. They cover only a small area worldwide but harbour high levels of biodiversity and contribute disproportionately to ecosystem services. Lakes differ with respect to their general type (e.g. land-locked, drainage, floodplain and large lakes) and position in the landscape (e.g. highland versus lowland lakes), which contribute to the dynamics of these systems. Lakes should be generally viewed as 'meta-systems', whereby biodiversity is strongly affected by species dispersal, and ecosystem dynamics are contributed by the flow of matter and substances among locations in a broader waterscape context. Lake connectivity in the waterscape and position in the landscape determine the degree to which a lake is prone to invasion by non-native species and accumulation of harmful substances. Highly connected lakes low in the landscape accumulate nutrients and pollutants originating from ecosystems higher in the landscape. The monitoring and restoration of lake biodiversity and ecosystem services should consider the fact that a high degree of dynamism is present at local, regional and global scales. However, local and regional monitoring may be plagued by the unpredictability of ecological phenomena, hindering adaptive management of lakes. Although monitoring data are increasingly becoming available to study responses of lakes to global change, we still lack suitable integration of models for entire waterscapes. Research across disciplinary boundaries is needed to address the challenges that lakes face in the Anthropocene because they may play an increasingly important role in harbouring unique aquatic biota as well as providing ecosystem goods and services in the future.
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Affiliation(s)
- Jani Heino
- Freshwater Centre, Finnish Environment Institute, Latokartanonkaari 11, FI-00790, Helsinki, Finland
| | - Janne Alahuhta
- Geography Research Unit, University of Oulu, P.O. Box 3000, FI-90014, Oulu, Finland
| | - Luis Mauricio Bini
- Departamento de Ecologia, Universidade Federal de Goiás, Goiânia, GO, 74690-900, Brazil
| | - Yongjiu Cai
- Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, 210008, Nanjing, China
| | - Anna-Stiina Heiskanen
- Freshwater Centre, Finnish Environment Institute, Latokartanonkaari 11, FI-00790, Helsinki, Finland
| | - Seppo Hellsten
- Freshwater Centre, Finnish Environment Institute, Latokartanonkaari 11, FI-00790, Helsinki, Finland
| | - Pirkko Kortelainen
- Freshwater Centre, Finnish Environment Institute, Latokartanonkaari 11, FI-00790, Helsinki, Finland
- Biodiversity Centre, Finnish Environment Institute, Latokartanonkaari 11, FI-00790, Helsinki, Finland
| | - Niina Kotamäki
- Freshwater Centre, Finnish Environment Institute, Latokartanonkaari 11, FI-00790, Helsinki, Finland
| | - Kimmo T Tolonen
- Freshwater Centre, Finnish Environment Institute, Latokartanonkaari 11, FI-00790, Helsinki, Finland
- Department of Biological and Environmental Sciences, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
| | - Petteri Vihervaara
- Biodiversity Centre, Finnish Environment Institute, Latokartanonkaari 11, FI-00790, Helsinki, Finland
| | - Annika Vilmi
- Freshwater Centre, Finnish Environment Institute, Latokartanonkaari 11, FI-00790, Helsinki, Finland
| | - David G Angeler
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Box 7050, 750 07, Uppsala, Sweden
- School of Natural Resources, University of Nebraska-Lincoln, Lincoln, NE, 68583-0984, U.S.A
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19
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Scarabotti PA, Lucifora LO, Espínola LA, Rabuffetti AP, Liotta J, Mantinian JE, Roux JP, Silva N, Balboni L, Vargas F, Demonte LD, Sánchez S. Long-term trends of fishery landings and target fish populations in the lower La Plata basin. NEOTROPICAL ICHTHYOLOGY 2021. [DOI: 10.1590/1982-0224-2021-0013] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Abstract The La Plata basin is the second largest basin of South America and has supported important river fisheries for more than a century. In this paper, we evaluate for the first time the historical trends of landings of 21 fish taxa and the recent population trends of 27 species of commercial fishes in the lower La Plata basin (Argentina). We compiled three kinds of data sets: Total fishery landings (between 1934 and 1986) and exports (1994‒2019), fisheries monitoring programs of Chaco and Santa Fe provinces in the Paraná River (2009‒2019), and surveys of fish populations in the Upper (Corrientes, 1993‒2020) and Middle (EBIPES, 2005‒2020) Paraná River. The analysis of the historical landings showed more species declining in the lower portion of the basin than in the upper basin. Regarding recent population trends, Pimelodus spp., Hoplias spp., Salminus brasiliensis, Luciopimelodus pati, and Ageneiosus spp. declined in more than one region, while Megaleporinus spp., Pterodoras granulosus, and Oxydoras kneri showed stable to positive trends, with the other species varying in their trends between regions. These tendencies could be associated to a combination of factors such as overfishing and environmental changes that would require an ecosystem approach for their adequate management.
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Affiliation(s)
- Pablo A. Scarabotti
- Universidad Nacional del Litoral, Argentina; Universidad Nacional del Litoral, Argentina
| | | | | | | | - Jorge Liotta
- Ministerio de Agricultura, Ganadería y Pesca de la Nación, Argentina; Museo Regional de Ciencias Naturales “Antonio Scasso”, Argentina
| | | | | | | | - Leandro Balboni
- Ministerio de Agricultura, Ganadería y Pesca de la Nación, Argentina
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20
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Larsen DA, Makaure J, Ryan SJ, Stewart D, Traub A, Welsh R, Love DH, Bisesi JH. Implications of Insecticide-Treated Mosquito Net Fishing in Lower Income Countries. ENVIRONMENTAL HEALTH PERSPECTIVES 2021; 129:15001. [PMID: 33417508 PMCID: PMC7793550 DOI: 10.1289/ehp7001] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 12/07/2020] [Accepted: 12/15/2020] [Indexed: 06/02/2023]
Abstract
INTRODUCTION Insecticide-treated mosquito nets (ITNs) are highly effective for the control of malaria. Yet widely distributed ITNs have been repurposed as fishing nets throughout the world. OBJECTIVES Herein we present a synthesis of the current knowledge of ITN fishing and the toxicity of pyrethroids and discuss the potential implications of widespread fishing with ITNs. We further review effective management strategies in tropical fisheries to explore a framework for managing potential ITN fishing impacts. DISCUSSION Pyrethroids are toxic to fish and aquatic environments, and fishing with ITNs may endanger the health of fisheries. Furthermore, although human toxicity to the pyrethroid insecticides that impregnate ITNs is traditionally thought to be low, recent scientific advances have shown that pyrethroid exposure is associated with a host of human health issues, including neurocognitive developmental disorders, diabetes, and cardiovascular disease. Although it is known that ITN fishing is widespread, the implications for both fisheries and human communities is understudied and may be severe. https://doi.org/10.1289/EHP7001.
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Affiliation(s)
- David A. Larsen
- Department of Public Health, Syracuse University, Syracuse, New York, USA
| | - Joseph Makaure
- Department of Environmental and Forest Biology, State University of New York College of Environmental Sciences and Forestry, Syracuse, New York, USA
| | - Sadie J. Ryan
- Department of Geography, University of Florida, Gainesville, Florida, USA
| | - Donald Stewart
- Department of Environmental and Forest Biology, State University of New York College of Environmental Sciences and Forestry, Syracuse, New York, USA
| | - Adrianne Traub
- Department of Nutrition and Food Studies, Syracuse University, Syracuse, New York, USA
| | - Rick Welsh
- Department of Nutrition and Food Studies, Syracuse University, Syracuse, New York, USA
| | - Deirdre H. Love
- Department of Environmental and Global Health and Center for Environmental and Human Toxicology, University of Florida, Gainesville, Florida, USA
| | - Joseph H. Bisesi
- Department of Environmental and Global Health and Center for Environmental and Human Toxicology, University of Florida, Gainesville, Florida, USA
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21
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Abstract
The COVID-19 pandemic has led to environmental recovery in some ecosystems from a global “anthropause,” yet such evidence for natural resources with extraction or production value (e.g., fisheries) is limited. This brief report provides a data-driven global snapshot of expert-perceived impacts of COVID-19 on inland fisheries. We distributed an online survey assessing perceptions of inland fishery pressures in June and July 2020 to basin-level inland fishery experts (i.e., identified by the Food and Agriculture Organization of the United Nations across the global North and South); 437 respondents from 79 countries addressed 93 unique hydrological basins, accounting for 82.1% of global inland fish catch. Based on the responses analyzed against extrinsic fish catch and human development index data, pandemic impacts on inland fisheries 1) add gradation to the largely positive environmental narrative of the global pandemic and 2) identify that basins of higher provisioning value are perceived to experience greater fishery pressures but may have limited compensatory capacity to mitigate COVID-19 impacts along with negative pressures already present.
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22
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Arunpandi N, Jyothibabu R, Jagadeesan L, Parthasarathi S, Albin KJ, Pandiyarajan RS. Impact of a large hydraulic barrage on the trace metals concentration in mesozooplankton in the Kochi backwaters, along the Southwest coast of India. MARINE POLLUTION BULLETIN 2020; 160:111568. [PMID: 32853836 DOI: 10.1016/j.marpolbul.2020.111568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 08/10/2020] [Accepted: 08/11/2020] [Indexed: 06/11/2023]
Abstract
This study delineates the impact of a man-made hydrological barrage [Thannermukkom barrage (TB)] on the concentration of selected trace metals (Fe, Zn, Cu, Co, Cr, Mn, Ni, Pb) in mesozooplankton from the Kochi backwaters (KBW). The overall results point out that during Pre-Southwest Monsoon (PRM), the concentration of trace metals in mesozooplankton was high in the upstream due to the closure of the barrage, which essentially causes stagnancy of the waters. Trace metal concentrations in the downstream and upstream regions of KBW were found to be lower during Post- Southwest Monsoon (PSWM) compared to the rest of the seasons. In general, trace metals in mesozooplankton from the KBW showed the following order of concentration: Fe > Mn > Zn > Ni > Cu > Cr > Co > Pb. A comparison with earlier data across the globe showed that trace metal concentration in mesoplankton in the KBW is lower than the values reported from other parts of the world.
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Affiliation(s)
- N Arunpandi
- CSIR - National Institute of Oceanography, Regional Centre, Kochi 682018, India
| | - R Jyothibabu
- CSIR - National Institute of Oceanography, Regional Centre, Kochi 682018, India.
| | - L Jagadeesan
- CSIR - National Institute of Oceanography, Regional Centre, Kochi 682018, India; CSIR-National Institute of Oceanography, Regional Centre, Visakhapatnam 530017, India
| | - S Parthasarathi
- CSIR - National Institute of Oceanography, Regional Centre, Kochi 682018, India
| | - K J Albin
- CSIR - National Institute of Oceanography, Regional Centre, Kochi 682018, India
| | - R S Pandiyarajan
- CSIR - National Institute of Oceanography, Regional Centre, Kochi 682018, India
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23
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Temporal Dynamics of Fish Assemblages as a Reflection of Policy Shift from Fishing Concession to Co-Management in One of the World’s Largest Tropical Flood Pulse Fisheries. WATER 2020. [DOI: 10.3390/w12112974] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Inland fisheries management in Cambodia has undergone two major policy reforms over the last two decades. These reforms led to the abolishment of a century-old commercial fishing lot system in 2012 and the establishment of new fish sanctuary and community fishing areas. However, the status of fisheries and fish assemblages following the reforms is not well understood. Here, we investigated the temporal changes in fish catch weight and fish assemblage structure for the period 1995–2000 before fishing lot abolishment (BLA) and for the period 2012–2015 after the removal of all fishing lots (after lot abolishment-ALA) using time-series fish catch data recorded from the Tonle Sap Lake (TSL), one of the world largest inland fisheries. We found (i) mean catch trends vary seasonally, with stable catch trends during the BLA and decreasing catch trends during the ALA and (ii) significant shifts in fish assemblage composition, notably a shift from large-bodied, migratory, and/or predatory species during the BLA toward more short-distance migratory and/or floodplain, small-bodied species during the ALA. Fishing lot abolishment coincided with substantial changes to floodplain habitats and increases in fishing pressure, threatening TSL fish stocks. Flow alterations caused by dams and climate change may exacerbate the problem. Therefore, to realize the fisheries reform objectives, it is imperative to strengthen the fisheries’ governance and management system, including effective law enforcement, institutional strengthening, improved planning, cooperation, and coordination as well as clearly defined roles and responsibilities among concerned stakeholders at all levels.
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24
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McGlue MM, Ivory SJ, Stone JR, Cohen AS, Kamulali TM, Latimer JC, Brannon MA, Kimirei IA, Soreghan MJ. Solar irradiance and ENSO affect food security in Lake Tanganyika, a major African inland fishery. SCIENCE ADVANCES 2020; 6:6/41/eabb2191. [PMID: 33036964 PMCID: PMC7546696 DOI: 10.1126/sciadv.abb2191] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Accepted: 08/20/2020] [Indexed: 06/11/2023]
Abstract
Food security in a warming world is a grave concern for rapidly growing impoverished populations. Low-latitude inland fisheries provide protein for millions of rural poor, yet the impacts of high-frequency climate oscillations on these aquatic ecosystems are unknown. Here, we present a sub-annual-to-annual resolution paleolimnological reconstruction of upwelling, productivity, and algal composition at Lake Tanganyika, one of Africa's largest landlocked fisheries. The data reveal increases in diatom production at centennial-scale solar irradiance maxima, and interannual variability in upwelling linked to La Niña. Our study shows that interactions between global climatic controls and El Niño-Southern Oscillation teleconnections exert profound influences on the foundation of Lake Tanganyika's food web. Adapting long-term management practices to account for high-frequency changes in algal production will help safeguard inland fish resources.
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Affiliation(s)
- M M McGlue
- Department of Earth and Environmental Sciences, University of Kentucky, Lexington, KY, USA.
| | - S J Ivory
- Department of Geosciences and Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA, USA
| | - J R Stone
- Department of Earth and Environmental Systems, Indiana State University, Terre Haute, IN, USA
| | - A S Cohen
- Department of Geosciences, University of Arizona, Tucson, AZ, USA
| | - T M Kamulali
- Department of Geosciences, University of Arizona, Tucson, AZ, USA
| | - J C Latimer
- Department of Earth and Environmental Systems, Indiana State University, Terre Haute, IN, USA
| | - M A Brannon
- Department of Earth and Environmental Sciences, University of Kentucky, Lexington, KY, USA
| | - I A Kimirei
- Tanzania Fisheries Research Institute, Dar es Salaam, Tanzania
| | - M J Soreghan
- School of Geosciences, University of Oklahoma, Norman, OK, USA
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25
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Kao YC, Rogers MW, Bunnell DB, Cowx IG, Qian SS, Anneville O, Beard TD, Brinker A, Britton JR, Chura-Cruz R, Gownaris NJ, Jackson JR, Kangur K, Kolding J, Lukin AA, Lynch AJ, Mercado-Silva N, Moncayo-Estrada R, Njaya FJ, Ostrovsky I, Rudstam LG, Sandström ALE, Sato Y, Siguayro-Mamani H, Thorpe A, van Zwieten PAM, Volta P, Wang Y, Weiperth A, Weyl OLF, Young JD. Effects of climate and land-use changes on fish catches across lakes at a global scale. Nat Commun 2020; 11:2526. [PMID: 32433562 PMCID: PMC7239917 DOI: 10.1038/s41467-020-14624-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Accepted: 01/20/2020] [Indexed: 11/09/2022] Open
Abstract
Globally, our knowledge on lake fisheries is still limited despite their importance to food security and livelihoods. Here we show that fish catches can respond either positively or negatively to climate and land-use changes, by analyzing time-series data (1970–2014) for 31 lakes across five continents. We find that effects of a climate or land-use driver (e.g., air temperature) on lake environment could be relatively consistent in directions, but consequential changes in a lake-environmental factor (e.g., water temperature) could result in either increases or decreases in fish catch in a given lake. A subsequent correlation analysis indicates that reductions in fish catch was less likely to occur in response to potential climate and land-use changes if a lake is located in a region with greater access to clean water. This finding suggests that adequate investments for water-quality protection and water-use efficiency can provide additional benefits to lake fisheries and food security. Lake fisheries are vulnerable to environmental changes. Here, Kao et al. develop a Bayesian networks model to analyze time-series data from 31 major fisheries lake across five continents, showing that fish catches can respond either positively or negatively to climate and land-use changes.
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Affiliation(s)
- Yu-Chun Kao
- Center for Systems Integration and Sustainability, Department of Fisheries and Wildlife, Michigan State University, 1405 South Harrison Road, East Lansing, MI, 48823, USA.
| | - Mark W Rogers
- US Geological Survey, Tennessee Cooperative Fishery Research Unit, Tennessee Technological University, Box 5114, Cookeville, TN, 38505, USA
| | - David B Bunnell
- US Geological Survey, Great Lakes Science Center, 1451 Green Road, Ann Arbor, MI, 48105, USA
| | - Ian G Cowx
- Hull International Fisheries Institute, University of Hull, Hull, HU6 7RX, UK
| | - Song S Qian
- Department of Environmental Sciences, University of Toledo, Mail Stop 604, Toledo, OH, 43606, USA
| | - Orlane Anneville
- Centre Alpin de Recherche sur les Réseaux Trophiques des Ecosystèmes Limniques (CARRTEL), Université Savoie Mont Blanc-INRAE, 75 bis avenue de Corzent, 74200, Thonon-les-Bains, France
| | - T Douglas Beard
- US Geological Survey, National Climate Adaptation Science Center, 12201 Sunrise Valley Drive, Mail Stop 516, Reston, VA, 20192, USA
| | - Alexander Brinker
- Fisheries Research Station of Baden-Württemberg, Argenweg 50/1, 88085, Langenargen, Germany
| | - J Robert Britton
- Department of Life and Environmental Sciences, Faculty of Science and Technology, Bournemouth University, Fern Barrow, Poole, Dorset, BH12 5BB, UK
| | - René Chura-Cruz
- Laboratorio Continental de Puno, Instituto del Mar del Perú, Avenida Circunvalación Sur 1911, Barrio San Martin, Puno, Perú
| | - Natasha J Gownaris
- Environmental Studies Department, Gettysburg College, Gettysburg, PA, 17325, USA
| | - James R Jackson
- Cornell Biological Field Station and Department of Natural Resources, Cornell University, 900 Shackelton Point Road, Bridgeport, NY, 13030, USA
| | - Külli Kangur
- Centre for Limnology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, 51117, Rannu, Tartu County, Estonia
| | - Jeppe Kolding
- Department of Biological Sciences, University of Bergen, P.O. Box 7803, N-5020, Bergen, Norway
| | - Anatoly A Lukin
- Federal Selection and Genetic Centre for Fish Breeding, Federal Agency on Agriculture, Ministry of Agriculture of Russia, Strelninskoe Av., 1, Saint-Petersburg region, Ropsha, Russian Federation
| | - Abigail J Lynch
- US Geological Survey, National Climate Adaptation Science Center, 12201 Sunrise Valley Drive, Mail Stop 516, Reston, VA, 20192, USA
| | - Norman Mercado-Silva
- Centro de Investigación en Biodiversidad y Conservación, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, C.P. 62209, Cuernavaca, Morelos, México
| | - Rodrigo Moncayo-Estrada
- Instituto Politécnico Nacional-CICIMAR and COFAA, Col. Playa Palo de Santa Rita, Código, Postal 23096, La Paz, B.C.S., México
| | - Friday J Njaya
- Malawi Department of Fisheries, P.O. Box 593, Lilongwe, Malawi
| | - Ilia Ostrovsky
- Israel Oceanographic and Limnological Research, Kinneret Limnological Laboratory, P.O. Box 447, Migdal, 1495001, Israel
| | - Lars G Rudstam
- Cornell Biological Field Station and Department of Natural Resources, Cornell University, 900 Shackelton Point Road, Bridgeport, NY, 13030, USA
| | - Alfred L E Sandström
- Department of Aquatic Resources, Swedish University of Agricultural Sciences, Stångholmsvägen 2, SE-17893, Drottningholm, Sweden
| | - Yuichi Sato
- Lake Biwa Environmental Research Institute, 5-34 Yanagasaki, Otsu, Shiga, 520-0022, Japan
| | - Humberto Siguayro-Mamani
- Laboratorio Continental de Puno, Instituto del Mar del Perú, Avenida Circunvalación Sur 1911, Barrio San Martin, Puno, Perú
| | - Andy Thorpe
- Faculty of Business and Law, University of Portsmouth, Richmond Building, Portland Street, Portsmouth, P01 3DE, UK
| | - Paul A M van Zwieten
- Aquaculture and Fisheries Group, Wageningen University, P.O. Box 338, 6700AH, Wageningen, The Netherlands
| | - Pietro Volta
- CNR Water Research Institute, Largo Tonolli 50, 28922, Verbania Pallanza, Italy
| | - Yuyu Wang
- School of Nature Conservation, Beijing Forestry University, Box 159, Beijing, 10083, People's Republic of China
| | - András Weiperth
- Faculty of Agriculture and Environmental Sciences, Institute of Aquaculture and Environmental Safety, Department of Aquaculture, Szent István University, Páter Károly utca 1, H-2100, Gödöllő, Hungary
| | - Olaf L F Weyl
- DSI/NRF Research Chair in Inland Fisheries and Freshwater Ecology, South African Institute for Aquatic Biodiversity, Makhanda, 6140, South Africa
| | - Joelle D Young
- Ontario Ministry of the Environment, Conservation and Parks, 125 Resources Road, Toronto, ON, M9P 3V6, Canada
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26
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Friant S, Ayambem WA, Alobi AO, Ifebueme NM, Otukpa OM, Ogar DA, Alawa CBI, Goldberg TL, Jacka JK, Rothman JM. Eating Bushmeat Improves Food Security in a Biodiversity and Infectious Disease "Hotspot". ECOHEALTH 2020; 17:125-138. [PMID: 32020354 DOI: 10.1007/s10393-020-01473-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 01/10/2020] [Accepted: 01/13/2020] [Indexed: 05/25/2023]
Abstract
Hunting and consumption of wild animals, colloquially known as "bushmeat," is associated with health trade-offs. Contact with wildlife increases exposure to wildlife-origin zoonotic diseases yet bushmeat is an important nutritional resource in many rural communities. In this study, we test the hypothesis that bushmeat improves food security in communities that hunt and trade bushmeat regularly. We conducted 478 interviews with men and women in six communities near Cross River National Park in Nigeria. We used interview responses to relate prevalence and diversity of bushmeat consumption to household food security status. Animal-based foods were the most commonly obtained items from the forest, and 48 types of wild vertebrate animals were consumed within the past 30 days. Seventy-five percent of households experienced some degree of food insecurity related to food access. Bushmeat consumption was significantly associated with relatively higher household food security status. Rodents were more important predictors of food security than other animal taxa. Despite increased bushmeat consumption in food-secure households, food-insecure households consumed a higher diversity of bushmeat species. Results show that consumption of bushmeat, especially rodents, is uniquely related to improved food security. Reliance on a wider diversity of species in food-insecure households may in turn affect their nutrition, exposures to reservoirs of zoonotic infections, and impact on wildlife conservation. Our results indicate that food security should be addressed in conservation and public health strategies aimed at reducing human-wildlife contact, and that improved wildlife protection, when combined with alternative animal-based foods, would positively affect food security in the long term.
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Affiliation(s)
- Sagan Friant
- Huck Institutes of the Life Sciences, Pennsylvania State University, University Park, PA, 16802, USA.
- Department of Anthropology, Pennsylvania State University, 522 Carpenter Building, University Park, PA, 16802, USA.
- Department of Anthropology, Hunter College City University of New York, New York, 10065, USA.
| | - Wilfred A Ayambem
- Department of Forestry and Wildlife Resources Management, University of Calabar, Calabar, Nigeria
| | - Alobi O Alobi
- Department of Forestry and Wildlife Resources Management, University of Calabar, Calabar, Nigeria
| | - Nzube M Ifebueme
- Department of Forestry and Wildlife Resources Management, University of Calabar, Calabar, Nigeria
| | - Oshama M Otukpa
- Department of Forestry and Wildlife Resources Management, University of Calabar, Calabar, Nigeria
| | - David A Ogar
- Department of Forestry and Wildlife Resources Management, University of Calabar, Calabar, Nigeria
| | - Clement B I Alawa
- Department of Veterinary Medicine, University of Abuja, Abuja, Nigeria
| | - Tony L Goldberg
- Department of Pathobiological Sciences, University of Wisconsin - Madison, Madison, WI, 53706, USA
| | - Jerry K Jacka
- Department of Anthropology, University of Colorado Boulder, Boulder, CO, 80309, USA
| | - Jessica M Rothman
- Department of Anthropology, Hunter College City University of New York, New York, 10065, USA
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27
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Tibihika PD, Curto M, Alemayehu E, Waidbacher H, Masembe C, Akoll P, Meimberg H. Molecular genetic diversity and differentiation of Nile tilapia (Oreochromis niloticus, L. 1758) in East African natural and stocked populations. BMC Evol Biol 2020; 20:16. [PMID: 32000675 PMCID: PMC6990601 DOI: 10.1186/s12862-020-1583-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Accepted: 01/16/2020] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND The need for enhancing the productivity of fisheries in Africa triggered the introduction of non-native fish, causing dramatic changes to local species. In East Africa, the extensive translocation of Nile tilapia (Oreochromis niloticus) is one of the major factors in this respect. Using 40 microsatellite loci with SSR-GBS techniques, we amplified a total of 664 individuals to investigate the genetic structure of O. niloticus from East Africa in comparison to Ethiopian and Burkina Faso populations. RESULTS All three African regions were characterized by independent gene-pools, however, the Ethiopian population from Lake Tana was genetically more divergent (Fst = 2.1) than expected suggesting that it might be a different sub-species. In East Africa, the genetic structure was congruent with both geographical location and anthropogenic activities (Isolation By Distance for East Africa, R2 = 0.67 and Uganda, R2 = 0.24). O. niloticus from Lake Turkana (Kenya) was isolated, while in Uganda, despite populations being rather similar to each other, two main natural catchments were able to be defined. We show that these two groups contributed to the gene-pool of different non-native populations. Moreover, admixture and possible hybridization with other tilapiine species may have contributed to the genetic divergence found in some populations such as Lake Victoria. We detected other factors that might be affecting Nile tilapia genetic variation. For example, most of the populations have gone through a reduction in genetic diversity, which can be a consequence of bottleneck (G-W, < 0.5) caused by overfishing, genetic erosion due to fragmentation or founder effect resulting from stocking activities. CONCLUSIONS The anthropogenic activities particularly in the East African O. niloticus translocations, promoted artificial admixture among Nile Tilapia populations. Translocations may also have triggered hybridization with the native congenerics, which needs to be further studied. These events may contribute to outbreeding depression and hence compromising the sustainability of the species in the region.
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Affiliation(s)
- Papius Dias Tibihika
- Institute for Integrative Nature Conservation Research, University of Natural Resources and Life Sciences Vienna (BOKU), Gregor Mendel Straße 33, 1180 Wien, Austria
- National Agricultural Research Organization, Kachwekano Zonal Agricultural Research and Development Institute, P.O. Box 421, Kabale, Uganda
| | - Manuel Curto
- Institute for Integrative Nature Conservation Research, University of Natural Resources and Life Sciences Vienna (BOKU), Gregor Mendel Straße 33, 1180 Wien, Austria
| | - Esayas Alemayehu
- National Agricultural Research Organization, Kachwekano Zonal Agricultural Research and Development Institute, P.O. Box 421, Kabale, Uganda
- Institute for Hydrobiology and Aquatic Ecosystems Management, University of Natural Resources and Life Sciences Vienna (BOKU), Gregor Mendel Straße 33/DG, 1180 Wien, Austria
| | - Herwig Waidbacher
- National Fishery and Aquatic Life Research Centre, P.O. Box 64, Addis Ababa, Sebeta Ethiopia
| | - Charles Masembe
- Department of Zoology, Entomology and Fisheries Sciences-Makerere University Kampala, P. O. Box, 7062 Kampala, Uganda
| | - Peter Akoll
- Department of Zoology, Entomology and Fisheries Sciences-Makerere University Kampala, P. O. Box, 7062 Kampala, Uganda
| | - Harald Meimberg
- Institute for Integrative Nature Conservation Research, University of Natural Resources and Life Sciences Vienna (BOKU), Gregor Mendel Straße 33, 1180 Wien, Austria
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28
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Camp EV, Kaemingk MA, Ahrens RNM, Potts WM, Pine WE, Weyl OLF, Pope KL. Resilience Management for Conservation of Inland Recreational Fisheries. Front Ecol Evol 2020. [DOI: 10.3389/fevo.2019.00498] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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29
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Wang Y, Kao YC, Zhou Y, Zhang H, Yu X, Lei G. Can water level management, stock enhancement, and fishery restriction offset negative effects of hydrological changes on the four major Chinese carps in China’s largest freshwater lake? Ecol Modell 2019. [DOI: 10.1016/j.ecolmodel.2019.03.020] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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30
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Lo M, Narulita S, Ickowitz A. The relationship between forests and freshwater fish consumption in rural Nigeria. PLoS One 2019; 14:e0218038. [PMID: 31185056 PMCID: PMC6559641 DOI: 10.1371/journal.pone.0218038] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2019] [Accepted: 05/23/2019] [Indexed: 01/11/2023] Open
Abstract
Nigerians depend on fish for maintaining diverse and healthy diets. Fish are a key source of protein and micronutrients, both of which are important for healthy diets. Some research has shown that forests provide important ecosystem functions that support the productive capacity and sustainability of inland fisheries. Our study aims to empirically assess the relationship between forest cover around rivers and fish consumption. We use data from the Living Standards Measurement Survey (LSMS) and spatially merge household and village data with forest cover and river maps. We estimate the relationship between forest cover around rivers and average village fresh fish consumption, while also accounting for other socio-economic and geographical determinants. We find that that the density of forest cover around rivers is positively and significantly correlated with village consumption of fresh fish. Our results suggest that forests influence the consumption of fresh fish by improving the productivity of inland fisheries and increasing the availability of fish. Aquatic habitats tend to be overlooked in debates on land use and food production, and yet can be critically important sources of nutrient-rich foods that are limited in rural diets in developing countries, particularly for the poor. Clearing forests for agriculture in order to produce more agricultural crops might have the unintended consequence of reducing another important food source.
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Affiliation(s)
- Michaela Lo
- Center for International Forestry Research (CIFOR), Bogor, Indonesia
- * E-mail:
| | - Sari Narulita
- Center for International Forestry Research (CIFOR), Bogor, Indonesia
| | - Amy Ickowitz
- Center for International Forestry Research (CIFOR), Bogor, Indonesia
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31
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Zhao K, García Molinos J, Zhang H, Zhang M, Xu J. Contemporary changes in structural dynamics and socioeconomic drivers of inland fishery in China. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 648:1527-1535. [PMID: 30340298 DOI: 10.1016/j.scitotenv.2018.08.196] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 07/31/2018] [Accepted: 08/15/2018] [Indexed: 06/08/2023]
Abstract
Dynamics of inland fishery remain poorly understood despite their increasing socioeconomic importance and rapid growth. Here we analyze the changes in the dynamics of Chinese traditional and new inland fisheries by examining 26 years (1991-2016) of reported annual catch and mean trophic level in relation to socioeconomic development in China at provincial level. Results from spatial panel linear models indicate a significant correlation between socioeconomic and fishery variables, strongly suggesting that the development of these fisheries is nested in the socioeconomic context specific to each province. A preference towards higher trophic level species (i.e., investment in quality) is revealed under a status of socioeconomic wealth, while a focus on production (i.e., quantity) is observed when population, and therefore food demand, increases. By providing novel evidence on the links between large-scale dynamics in production and trophic structure of a country's inland fishery and the socioeconomic context driving the fish demand and consumption, our work represents an important contribution towards a broader assessment and management of inland fishery resources.
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Affiliation(s)
- Kangshun Zhao
- Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jorge García Molinos
- Arctic Research Center, Hokkaido University, N21W11, Sapporo 001-0021, Japan; Global Station for Arctic Research, Global Institution for Collaborative Research and Education, N21W11, Hokkaido University, Sapporo 001-0021, Japan; Graduate School of Environmental Science, Hokkaido University, N10W5, Sapporo 060-0810, Japan
| | - Huan Zhang
- Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Min Zhang
- College of Fisheries, Huazhong Agricultural University, Hubei Provincial Engineering Laboratory for Pond Aquaculture, Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Wuhan, China.
| | - Jun Xu
- Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
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32
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Assessment of Community Fish Refuge Management Practice in the Siem Reap Province of Cambodia. ENVIRONMENTS 2018. [DOI: 10.3390/environments6010001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The Community Fish Refuge (CFR) is a fish conservation measure that is intended to improve the productivity of rice field fisheries and provide safe refuges for fish during the dry season. Cambodia’s Fisheries Administration aims to develop one well-working CFR in every 1200 communes by 2019. This study assesses the current situation of the rice field fisheries in the Srey Snam district, Siem Reap province, examines community members’ awareness of fish refuge management; and examines the socioeconomic impacts of the CFR among its beneficiaries. Data collected by interviewing 120 households reveal that 85 percent of respondents pursued rice field fishery as part-time work, catching on average 5.2 kg of fish daily during the ten-month harvest period. Most fish products were used for home consumption. Total household saving and income from fish production significantly increased after community members joined CFRs. Respondents’ expenditures, savings and assets also increased after CFR intervention, indicating improvements in livelihood. Illegal fishing and budgetary constraint to implementing CFR interventions are the pressing problems facing the users. The paper ends by outlining measures that could help strengthen and sustain CFRs.
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33
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Moran EF, Lopez MC, Moore N, Müller N, Hyndman DW. Sustainable hydropower in the 21st century. Proc Natl Acad Sci U S A 2018; 115:11891-11898. [PMID: 30397145 PMCID: PMC6255148 DOI: 10.1073/pnas.1809426115] [Citation(s) in RCA: 99] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Hydropower has been the leading source of renewable energy across the world, accounting for up to 71% of this supply as of 2016. This capacity was built up in North America and Europe between 1920 and 1970 when thousands of dams were built. Big dams stopped being built in developed nations, because the best sites for dams were already developed and environmental and social concerns made the costs unacceptable. Nowadays, more dams are being removed in North America and Europe than are being built. The hydropower industry moved to building dams in the developing world and since the 1970s, began to build even larger hydropower dams along the Mekong River Basin, the Amazon River Basin, and the Congo River Basin. The same problems are being repeated: disrupting river ecology, deforestation, losing aquatic and terrestrial biodiversity, releasing substantial greenhouse gases, displacing thousands of people, and altering people's livelihoods plus affecting the food systems, water quality, and agriculture near them. This paper studies the proliferation of large dams in developing countries and the importance of incorporating climate change into considerations of whether to build a dam along with some of the governance and compensation challenges. We also examine the overestimation of benefits and underestimation of costs along with changes that are needed to address the legitimate social and environmental concerns of people living in areas where dams are planned. Finally, we propose innovative solutions that can move hydropower toward sustainable practices together with solar, wind, and other renewable sources.
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Affiliation(s)
- Emilio F Moran
- Department of Geography, Environment and Spatial Sciences, Michigan State University, East Lansing, MI 48824;
| | - Maria Claudia Lopez
- Department of Community Sustainability, Michigan State University, East Lansing, MI 48824
| | - Nathan Moore
- Department of Geography, Environment and Spatial Sciences, Michigan State University, East Lansing, MI 48824
| | - Norbert Müller
- Department of Mechanical Engineering, Michigan State University, East Lansing, MI 48824
| | - David W Hyndman
- Department of Earth and Environmental Sciences, Michigan State University, East Lansing, MI 48824
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34
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Begossi A, Salivonchyk SV, Hallwass G, Hanazaki N, Lopes PFM, Silvano RAM, Dumaresq D, Pittock J. Fish consumption on the Amazon: a review of biodiversity, hydropower and food security issues. BRAZ J BIOL 2018; 79:345-357. [PMID: 30379202 DOI: 10.1590/1519-6984.186572] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Accepted: 11/22/2017] [Indexed: 11/21/2022] Open
Abstract
The lack of knowledge about the majority of fish species harvested in Amazonian small-scale fisheries, in association with impacts from hydroelectric power plants, may lead to biodiversity loss and a decrease in the protein food supply for riverine Amazonians. This study uses existing datasets on fisheries and riverine developmental projects to infer effects associated with fish losses where actual data and outcomes are not available. The targeted fish species' status may be regarded as either threatened or there being no knowledge of their conservation requirements, biology or ecology. Among the 90 Amazonian fish species that are the most important for the diet of the riverine fishers, 78% are not assessed or their biological information is unknown, according to the IUCN Red List. Consequently, the effects created by the thoroughly disregarded trade-off between energy generation and food security in the planning of Amazonian land use have been worsened by the lack of biological and ecological information on fish species.
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Affiliation(s)
- A Begossi
- Programa de Capacitação de Pescadores Artesanais - CAPESCA, Núcleo de Estudos e Pesquisas em Alimentação - NEPA, Universidade Estadual de Campinas - UNICAMP, Rua Albert Einstein, nº 291, CEP 13083-852, Campinas, SP, Brasil.,Programa de Pós-graduação em Sustentabilidade de Ecossistemas Costeiros e Marinhos - PPG-ECOMAR, Universidade Santa Cecília - UNISANTA, Rua Oswaldo Cruz, nº 277, Boqueirão, CEP 11045-907, Santos, SP, Brasil.,Fisheries and Food Institute - FIFO, Rua Oswaldo Cruz, nº 277, Boqueirão, CEP 11045-907, Santos, SP, Brasil
| | - S V Salivonchyk
- Institute for Nature Management, National Academy of Sciences of Belarus, 10 Fr. Skaryna Street, Minsk, 220114, Minsk, Belarus
| | - G Hallwass
- Fisheries and Food Institute - FIFO, Rua Oswaldo Cruz, nº 277, Boqueirão, CEP 11045-907, Santos, SP, Brasil.,Universidade Federal do Oeste do Pará - UFOPA, Rodovia -254, nº 257, CEP 68270-000, Oriximiná, PA, Brasil
| | - N Hanazaki
- Fisheries and Food Institute - FIFO, Rua Oswaldo Cruz, nº 277, Boqueirão, CEP 11045-907, Santos, SP, Brasil.,Departmento de Ecologia e Zoologia, Universidade Federal de Santa Catarina - UFSC, Campus Universitário, Córrego Grande, CEP 88040-900, Florianópolis, SC, Brasil
| | - P F M Lopes
- Fisheries and Food Institute - FIFO, Rua Oswaldo Cruz, nº 277, Boqueirão, CEP 11045-907, Santos, SP, Brasil.,Departamento de Ecologia, Universidade Federal de Rio Grande do Norte - UFRN, Av. Sen. Salgado Filho, nº 3000, Lagoa Nova, CEP 59064-741, Natal, RN, Brasil
| | - R A M Silvano
- Fisheries and Food Institute - FIFO, Rua Oswaldo Cruz, nº 277, Boqueirão, CEP 11045-907, Santos, SP, Brasil.,Programa de Pós-graduação em Ecologia, Departamento de Ecologia, Universidade Federal do Rio Grande do Sul - UFRGS, CP 15007, CEP 91501-970, Porto Alegre, RS, Brasil
| | - D Dumaresq
- Fenner School of Environment and Society, The Australian National University - ANU, B141, B48, B48A, Linnaeus Way, Acton ACT 2601, Canberra, Australia
| | - J Pittock
- Fenner School of Environment and Society, The Australian National University - ANU, B141, B48, B48A, Linnaeus Way, Acton ACT 2601, Canberra, Australia
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35
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Lapointe D, Cooperman MS, Chapman LJ, Clark TD, Val AL, Ferreira MS, Balirwa JS, Mbabazi D, Mwanja M, Chhom L, Hannah L, Kaufman L, Farrell AP, Cooke SJ. Predicted impacts of climate warming on aerobic performance and upper thermal tolerance of six tropical freshwater fishes spanning three continents. CONSERVATION PHYSIOLOGY 2018; 6:coy056. [PMID: 30364036 PMCID: PMC6188536 DOI: 10.1093/conphys/coy056] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Revised: 08/31/2018] [Accepted: 09/06/2018] [Indexed: 05/30/2023]
Abstract
Equatorial fishes, and the critically important fisheries based on them, are thought to be at-risk from climate warming because the fishes have evolved in a relatively aseasonal environment and possess narrow thermal tolerance windows that are close to upper thermal limits. We assessed survival, growth, aerobic performance and critical thermal maxima (CTmax) following acute and 21 d exposures to temperatures up to 4°C higher than current maxima for six species of freshwater fishes indigenous to tropical countries and of importance for human consumption. All six species showed 1.3-1.7°C increases in CTmax with a 4°C rise in acclimation temperature, values which match up well with fishes from other climatic regions, and five species had survival >87% at all temperatures over the treatment period. Specific growth rates varied among and within each species in response to temperature treatments. For all species, the response of resting metabolic rate (RMR) was consistently more dynamic than for maximum metabolic rate, but in general both acute temperature exposure and thermal acclimation had only modest effects on aerobic scope (AS). However, RMR increased after warm acclimation in 5 of 6 species, suggesting incomplete metabolic compensation. Taken in total, our results show that each species had some ability to perform at temperatures up to 4°C above current maxima, yet also displayed certain areas of concern for their long-term welfare. We therefore suggest caution against the overly broad generalization that all tropical freshwater fish species will face severe challenges from warming temperatures in the coming decades and that future vulnerability assessments should integrate multiple performance metrics as opposed to relying on a single response metric. Given the societal significance of inland fisheries in many parts of the tropics, our results clearly demonstrate the need for more species-specific studies of adaptive capacity to climate change-related challenges.
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Affiliation(s)
- Dominique Lapointe
- St. Lawrence River Institute of Environmental Sciences, Cornwall, ON, Canada
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology and Institute of Environmental Science, Carleton University, Ottawa, ON, Canada
| | - Michael S Cooperman
- Gordon and Betty Moore Center for Science, Conservation International, Arlington, VA, USA
| | | | - Timothy D Clark
- Deakin University, School of Life and Environmental Sciences, Geelong, Victoria, Australia
| | - Adalberto L Val
- Brazilian Institute for Research of the Amazon—INPA, Manaus, AM, Brazil
| | - Marcio S Ferreira
- Brazilian Institute for Research of the Amazon—INPA, Manaus, AM, Brazil
| | - John S Balirwa
- National Fisheries Resources Research Institute—NaFIRRI, Jinja, Uganda
| | - Dismas Mbabazi
- Aquaculture Research and Development Center—ARDC, NaFIRRI (Kajjansi), Kampala, Uganda
| | - Matthew Mwanja
- Aquaculture Research and Development Center—ARDC, NaFIRRI (Kajjansi), Kampala, Uganda
| | | | - Lee Hannah
- Bren School of Environmental Science & Management, University of California, Santa Barbara, CA, USA
| | - Les Kaufman
- Department of Biology, Boston University, Boston, MA, USA
| | - Anthony P Farrell
- Zoology Department and Faculty of Land and Food Systems, University of British Columbia, Vancouver, BC, Canada
| | - Steven J Cooke
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology and Institute of Environmental Science, Carleton University, Ottawa, ON, Canada
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36
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Kissling WD, Walls R, Bowser A, Jones MO, Kattge J, Agosti D, Amengual J, Basset A, van Bodegom PM, Cornelissen JHC, Denny EG, Deudero S, Egloff W, Elmendorf SC, Alonso García E, Jones KD, Jones OR, Lavorel S, Lear D, Navarro LM, Pawar S, Pirzl R, Rüger N, Sal S, Salguero-Gómez R, Schigel D, Schulz KS, Skidmore A, Guralnick RP. Towards global data products of Essential Biodiversity Variables on species traits. Nat Ecol Evol 2018; 2:1531-1540. [PMID: 30224814 DOI: 10.1038/s41559-018-0667-3] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2018] [Accepted: 07/16/2018] [Indexed: 02/03/2023]
Abstract
Essential Biodiversity Variables (EBVs) allow observation and reporting of global biodiversity change, but a detailed framework for the empirical derivation of specific EBVs has yet to be developed. Here, we re-examine and refine the previous candidate set of species traits EBVs and show how traits related to phenology, morphology, reproduction, physiology and movement can contribute to EBV operationalization. The selected EBVs express intra-specific trait variation and allow monitoring of how organisms respond to global change. We evaluate the societal relevance of species traits EBVs for policy targets and demonstrate how open, interoperable and machine-readable trait data enable the building of EBV data products. We outline collection methods, meta(data) standardization, reproducible workflows, semantic tools and licence requirements for producing species traits EBVs. An operationalization is critical for assessing progress towards biodiversity conservation and sustainable development goals and has wide implications for data-intensive science in ecology, biogeography, conservation and Earth observation.
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Affiliation(s)
- W Daniel Kissling
- Department of Theoretical and Computational Ecology, Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, Amsterdam, The Netherlands.
| | | | - Anne Bowser
- Woodrow Wilson International Center for Scholars, Washington DC, USA
| | - Matthew O Jones
- University of Montana, W. A. Franke Department of Forestry and Conservation, Missoula, MT, USA
| | - Jens Kattge
- Max Planck Institute for Biogeochemistry, Jena, Germany.,German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
| | | | - Josep Amengual
- Area de Conservacion, Seguimiento y Programas de la Red, Organismo Autonomo Parques Nacionales, Ministerio de Agricultura y Pesca, Madrid, Spain
| | - Alberto Basset
- Department of Biological and Environmental Sciences and Technologies, University of Salento, Lecce, Italy
| | - Peter M van Bodegom
- Institute of Environmental Sciences, Leiden University, Leiden, The Netherlands
| | - Johannes H C Cornelissen
- Systems Ecology, Department of Ecological Science, Vrije Universiteit, Amsterdam, The Netherlands
| | - Ellen G Denny
- USA National Phenology Network, University of Arizona, Tucson, AZ, USA
| | - Salud Deudero
- Instituto Español de Oceanografía, Centro Oceanográfico de Baleares, Palma de Mallorca, Spain
| | | | - Sarah C Elmendorf
- National Ecological Observatory Network, Battelle Ecology, Boulder, CO, USA.,Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO, USA
| | | | - Katherine D Jones
- National Ecological Observatory Network, Battelle Ecology, Boulder, CO, USA
| | - Owen R Jones
- Department of Biology, University of Southern Denmark, Odense M, Denmark
| | - Sandra Lavorel
- Laboratoire d'Ecologie Alpine, CNRS - Université Grenoble Alpes, Grenoble, France
| | - Dan Lear
- Marine Biological Association of the United Kingdom, Plymouth, Devon, UK
| | - Laetitia M Navarro
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany.,Institute of Biology, Martin Luther University Halle Wittenberg, Halle (Saale), Germany
| | - Samraat Pawar
- Department of Life Sciences, Imperial College London, Ascot, Berkshire, UK
| | - Rebecca Pirzl
- CSIRO and Atlas of Living Australia, Canberra, Australian Capital Territory, Australia
| | - Nadja Rüger
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany.,Smithsonian Tropical Research Institute, Ancon, Panama
| | - Sofia Sal
- Department of Life Sciences, Imperial College London, Ascot, Berkshire, UK
| | - Roberto Salguero-Gómez
- Department of Zoology, Oxford University, Oxford, UK.,Department of Animal and Plant Sciences, University of Sheffield, Sheffield, UK.,Centre for Biodiversity and Conservation Science, University of Queensland, St Lucia, Queensland, Australia.,Evolutionary Demography Laboratory, Max Plank Institute for Demographic Research, Rostock, Germany
| | - Dmitry Schigel
- Global Biodiversity Information Facility (GBIF), Secretariat, Copenhagen, Denmark
| | - Katja-Sabine Schulz
- Smithsonian Institution, National Museum of Natural History, Washington DC, USA
| | - Andrew Skidmore
- Department of Natural Resources, Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, Enschede, The Netherlands.,Department of Environmental Science, Macquarie University, New South Wales, Australia
| | - Robert P Guralnick
- Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
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Shechonge A, Ngatunga BP, Tamatamah R, Bradbeer SJ, Harrington J, Ford AGP, Turner GF, Genner MJ. Losing cichlid fish biodiversity: genetic and morphological homogenization of tilapia following colonization by introduced species. CONSERV GENET 2018; 19:1199-1209. [PMID: 30363773 PMCID: PMC6182432 DOI: 10.1007/s10592-018-1088-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Accepted: 07/09/2018] [Indexed: 11/04/2022]
Abstract
Among the many negative impacts of invasive species, hybridization with indigenous species has increasingly become recognized as a major issue. However, relatively few studies have characterized the phenotypic outcomes of hybridization following biological invasions. Here we investigate the genetic and morphological consequences of stocking invasive tilapia species in two water bodies in central Tanzania. We sampled individuals from the Mindu Reservoir on the Ruvu river system, and at Kidatu on the Great Ruaha-Rufiji river system. We screened individuals at 16 microsatellite loci, and quantified morphology using geometric morphometrics and linear measurements. In both the Mindu and Kidatu systems, we identified evidence of hybridization between indigenous Wami tilapia (Oreochromis urolepis) and the introduced Nile tilapia (Oreochromis niloticus) or blue-spotted tilapia (Oreochromis leucostictus). At both sites, purebred individuals could largely be separated using geometric morphometric variables, with hybrids occupying a broad morphospace among the parental species. Our data demonstrate that the gene pools and phenotypic identity of the indigenous O. urolepis have been severely impacted by the stocking of the invasive species. Given the lack of evidence for clear commercial benefits from stocking invasive tilapia species in waters already populated by indigenous congenerics, we suggest further spread of introduced species should be undertaken with considerable caution.
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Affiliation(s)
- Asilatu Shechonge
- Department of Aquatic Sciences and Fisheries, University of Dar es Salaam, P.O. Box 35064, Dar es Salaam, Tanzania
- Tanzania Fisheries Research Institute (TAFIRI), P.O. Box 9750, Dar es Salaam, Tanzania
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
| | - Benjamin P. Ngatunga
- Department of Aquatic Sciences and Fisheries, University of Dar es Salaam, P.O. Box 35064, Dar es Salaam, Tanzania
| | - Rashid Tamatamah
- Department of Aquatic Sciences and Fisheries, University of Dar es Salaam, P.O. Box 35064, Dar es Salaam, Tanzania
- Tanzania Fisheries Research Institute (TAFIRI), P.O. Box 9750, Dar es Salaam, Tanzania
| | - Stephanie J. Bradbeer
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
| | - Jack Harrington
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
| | - Antonia G. P. Ford
- Department of Life Sciences, Whitelands College, University of Roehampton, Holybourne Avenue, London, SW15 4JD UK
| | - George F. Turner
- School of Biological Sciences, Bangor University, Bangor, Gwynedd LL57 2UW UK
| | - Martin J. Genner
- School of Biological Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ UK
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38
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Jaya-Ram A, Fuad F, Zakeyuddin MS, Sah ASRM. Muscle Fatty Acid Content in Selected Freshwater Fish from Bukit Merah Reservoir, Perak, Malaysia. Trop Life Sci Res 2018; 29:103-117. [PMID: 30112144 PMCID: PMC6072723 DOI: 10.21315/tlsr2018.29.2.8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
One of the oldest reservoirs in Peninsular Malaysia, Bukit Merah Reservoir, is a place in which locals participate in fishing activities. Inland fisheries are important to individuals, society and the environment; whereby they generate a source of income and food security. It is essential to gauge the nutrition value of fish caught in this location as food source, especially in terms of fatty acid composition, to better demonstrate its potential towards the betterment of human health and general well-being. From an initial list of 47 fish species available in Bukit Merah Reservoir, a total of seven edible freshwater fish species were identified, namely tinfoil barb (Barbonymus schwanenfeldii), Javanese barb (Barbonymus gonionotus), hampala barb (Hampala macrolepidota), beardless barb (Cyclocheilichthys apogon), glassfish (Oxygaster anomalura), striped snakehead (Channa striata) and horseface loach (Acantopsis dialuzona), and muscle fatty acid content was analysed to determine their nutritional value. Muscle of cyprinid fish contained substantial amount of omega-3 long-chain polyunsaturated fatty acids (LC-PUFA) compared to fish from Channidae and Cobitidae families. Javanese and tinfoil barbs muscle recorded the highest levels of combined eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) indicating the highest nutritional value comparatively. Unexpectedly, the striped snakehead, a predatory carnivore, contained lower levels of LC-PUFA compared to detrivorous/herbivorous fishes. This further justifies that the omega-3 polyunsaturated fatty acids (PUFA) content in fish muscle varies according to their feeding habits. Even though it has been recommended that marine fish be consumed to improve health to a certain extent, there still are benefits of consuming freshwater fish, as there are several species which contain considerable amounts of beneficial omega-3 PUFA.
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Affiliation(s)
- Annette Jaya-Ram
- Centre for Marine and Coastal Studies, Universiti Sains Malaysia, 11800 USM Pulau Pinang, Malaysia
| | - Farhana Fuad
- School of Biological Sciences, Universiti Sains Malaysia, 11800 USM Pulau Pinang, Malaysia
| | - Mohd Shafiq Zakeyuddin
- School of Biological Sciences, Universiti Sains Malaysia, 11800 USM Pulau Pinang, Malaysia
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39
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Global hidden harvest of freshwater fish revealed by household surveys. Proc Natl Acad Sci U S A 2018; 115:7623-7628. [PMID: 29915069 DOI: 10.1073/pnas.1721097115] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Consumption of wild-caught freshwater fish is concentrated in low-income countries, where it makes a critical contribution to food security and livelihoods. Underestimation of inland harvests in official statistics has long been suspected due to unmonitored subsistence fisheries. To overcome the lack of data from extensive small-scale harvests, we used household consumption surveys to estimate freshwater fish catches in 42 low- and middle-income countries between 1997 and 2014. After accounting for trade and aquaculture, these countries collectively consumed 3.6 MT (CI, 1.5-5.8) more wild-caught freshwater fish than officially reported, reflecting a net underreporting of 64.8% (CI, 27.1-103.9%). Individual countries were more likely to underestimate (n = 31) than overestimate (n = 11) catches, despite conservative assumptions in our calculations. Extrapolating our findings suggests that the global inland catch reported as 10.3 MT in 2008 was more likely 16.6 MT (CI, 2.3-30.9), which accords with recent independent predictions for rivers and lakes. In human terms, these hidden harvests are equivalent to the total animal protein consumption of 36.9 (CI, 30.8-43.4) million people, including many who rely upon wild fish to achieve even minimal protein intake. The widespread underreporting uncovered by household consumption surveys indicates that inland fisheries contribute far more to global food security than has been recognized previously. Our findings also amplify concerns about the sustainability of intensive fishery exploitation as degradation of rivers, lakes, and wetlands continues apace.
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40
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Ngor PB, McCann KS, Grenouillet G, So N, McMeans BC, Fraser E, Lek S. Evidence of indiscriminate fishing effects in one of the world's largest inland fisheries. Sci Rep 2018; 8:8947. [PMID: 29895943 PMCID: PMC5997758 DOI: 10.1038/s41598-018-27340-1] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Accepted: 05/29/2018] [Indexed: 11/08/2022] Open
Abstract
While human impacts like fishing have altered marine food web composition and body size, the status of the world's important tropical inland fisheries remains largely unknown. Here, we look for signatures of human impacts on the indiscriminately fished Tonle Sap fish community that supports one of the world's largest freshwater fisheries. By analyzing a 15-year time-series (2000-2015) of fish catches for 116 species obtained from an industrial-scale 'Dai' fishery, we find: (i) 78% of the species exhibited decreasing catches through time; (ii) downward trends in catches occurred primarily in medium to large-bodied species that tend to occupy high trophic levels; (iii) a relatively stable or increasing trend in catches of small-sized species, and; (iv) a decrease in the individual fish weights and lengths for several common species. Because total biomass of the catch has remained remarkably resilient over the last 15 years, the increase in catch of smaller species has compensated for declines in larger species. Our finding of sustained production but altered community composition is consistent with predictions from recent indiscriminate theory, and gives a warning signal to fisheries managers and conservationists that the species-rich Tonle Sap is being affected by heavy indiscriminate fishing pressure.
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Affiliation(s)
- Peng Bun Ngor
- Fisheries Administration, No. 186, Preah Norodom Blvd., Khan Chamcar Morn, P.O. Box 582, Phnom Penh, Cambodia.
- CNRS, Université Toulouse III Paul Sabatier, ENFA; UMR5174 EDB (Laboratoire Évolution & Diversité Biologique), 118 route de Narbonne, F-31062, Toulouse, France.
| | | | - Gaël Grenouillet
- CNRS, Université Toulouse III Paul Sabatier, ENFA; UMR5174 EDB (Laboratoire Évolution & Diversité Biologique), 118 route de Narbonne, F-31062, Toulouse, France
| | - Nam So
- Mekong River Commission Secretariat, Vientiane, Lao PDR
| | | | - Evan Fraser
- University of Guelph, Guelph Ontario, Canada
| | - Sovan Lek
- CNRS, Université Toulouse III Paul Sabatier, ENFA; UMR5174 EDB (Laboratoire Évolution & Diversité Biologique), 118 route de Narbonne, F-31062, Toulouse, France
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41
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Evaluation of Small-Scale Fishers’ Perceptions on Climate Change and Their Coping Strategies: Insights from Lake Malawi. CLIMATE 2018. [DOI: 10.3390/cli6020034] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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42
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Smederevac-Lalić MM, Kalauzi AJ, Regner SB, Lenhardt MB, Naunovic ZZ, Hegediš AE. Prediction of fish catch in the Danube River based on long-term variability in environmental parameters and catch statistics. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 609:664-671. [PMID: 28763663 DOI: 10.1016/j.scitotenv.2017.07.177] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 07/12/2017] [Accepted: 07/20/2017] [Indexed: 06/07/2023]
Abstract
The effects of physical factors on fish catch in the Serbian part of the Danube River were studied for period of six decades. The data on total catch for the Danube River from river kilometre 845 to river kilometre 1433 were collected from Statistical Office of the Republic of Serbia, while water level and water temperature data were collected from 16 water gauge stations along the investigated part of the Danube River for the period 1948-2009. Cross-correlation functions have been used to analyse the functional connection between Danube water level, water temperature and fish catch while ARMA model which combines cyclic (deterministic) and random (stochastic) components of the analysed sequences was used for the forecasts. The cross-correlation function showed negative correlation between water level and temperature as well as between water temperature and catch and positive correlation between water level and catch. The Danube water level and catch were coherent at the periods of 2.06, 4.13, 6.2, 10.33, 20.66years, while the cross correlation function between these time series did not show phase lag. The results of reconstruction and forecast of water level, temperature, and catch of fish in the Danube River, obtained by summing the cyclic and stochastic components, was used for the forecast till 2029. In 2016, seven years after, the initial forecasts were made, validity of the model was checked by obtaining data for water temperature, water level and fish catch in the Danube River for the period 2010-2015. Model gave the best prediction for water temperature; average standard error was 1.6 times higher for predicted value than for model value while for fish catch and water level they were 1.96 and 4.97, respectively. Methods used in this work could be powerful tool for prediction of fish catch and serve as the basis for better fisheries management.
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Affiliation(s)
- Marija M Smederevac-Lalić
- University of Belgrade, Institute for Multidisciplinary Research, Kneza Višeslava 1, 11000 Belgrade, Serbia.
| | - Aleksandar J Kalauzi
- University of Belgrade, Institute for Multidisciplinary Research, Kneza Višeslava 1, 11000 Belgrade, Serbia.
| | - Slobodan B Regner
- University of Belgrade, Institute for Multidisciplinary Research, Kneza Višeslava 1, 11000 Belgrade, Serbia.
| | - Mirjana B Lenhardt
- University of Belgrade, Institute for Biological Research, Bulevar Despota Stefana 142, 11000 Belgrade, Serbia.
| | - Zorana Z Naunovic
- University of Belgrade, Faculty of Civil Engineering, Department of Hydraulic and Environmental Engineering, Bulevar kralja Aleksandra 73, Belgrade, Serbia.
| | - Aleksandar E Hegediš
- University of Belgrade, Institute for Multidisciplinary Research, Kneza Višeslava 1, 11000 Belgrade, Serbia.
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44
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Grafeld S, Oleson KLL, Teneva L, Kittinger JN. Follow that fish: Uncovering the hidden blue economy in coral reef fisheries. PLoS One 2017; 12:e0182104. [PMID: 28771508 PMCID: PMC5542444 DOI: 10.1371/journal.pone.0182104] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Accepted: 07/12/2017] [Indexed: 11/18/2022] Open
Abstract
Despite their importance for human well-being, nearshore fisheries are often data poor, undervalued, and underappreciated in policy and development programs. We assess the value chain for nearshore Hawaiian coral reef fisheries, mapping post-catch distribution and disposition, and quantifying associated monetary, food security, and cultural values. We estimate that the total annual value of the nearshore fishery in Hawaiʻi is $10.3-$16.4 million, composed of non-commercial ($7.2-$12.9 million) and commercial ($2.97 million licensed + $148,500-$445,500 unlicensed) catch. Hawaii’s nearshore fisheries provide >7 million meals annually, with most (>5 million) from the non-commercial sector. Over a third (36%) of meals were planktivores, 26% piscivores, 21% primary consumers, and 18% secondary consumers. Only 62% of licensed commercial catch is accounted for in purchase reports, leaving 38% of landings unreported in sales. Value chains are complex, with major buyers for the commercial fishery including grocery stores (66%), retailers (19%), wholesalers (14%), and restaurants (<1%), who also trade and sell amongst themselves. The bulk of total nearshore catch (72–74%) follows a short value chain, with non-commercial fishers keeping catch for household consumption or community sharing. A small amount (~37,000kg) of reef fish—the equivalent of 1.8% of local catch—is imported annually into Hawaiʻi, 23,000kg of which arrives as passenger luggage on commercial flights from Micronesia. Evidence of exports to the US mainland exists, but is unquantifiable given existing data. Hawaiian nearshore fisheries support fundamental cultural values including subsistence, activity, traditional knowledge, and social cohesion. These small-scale coral reef fisheries provide large-scale benefits to the economy, food security, and cultural practices of Hawaiʻi, underscoring the need for sustainable management. This research highlights the value of information on the value chain for small-scale production systems, making the hidden economy of these fisheries visible and illuminating a range of conservation interventions applicable to Hawaiʻi and beyond.
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Affiliation(s)
- Shanna Grafeld
- Department of Natural Resources and Environmental Management, University of Hawaiʻi at Mānoa, Honolulu, Hawaii, United States of America
- * E-mail:
| | - Kirsten L. L. Oleson
- Department of Natural Resources and Environmental Management, University of Hawaiʻi at Mānoa, Honolulu, Hawaii, United States of America
| | - Lida Teneva
- Conservation International, Center for Oceans, Honolulu, Hawaii, United States of America
| | - John N. Kittinger
- Conservation International, Center for Oceans, Honolulu, Hawaii, United States of America
- Arizona State University, Center for Biodiversity Outcomes, Julie Ann Wrigley Global Institute of Sustainability, Life Sciences Center, Tempe, Arizona
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45
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Elmer LK, Kelly LA, Rivest S, Steell SC, Twardek WM, Danylchuk AJ, Arlinghaus R, Bennett JR, Cooke SJ. Angling into the Future: Ten Commandments for Recreational Fisheries Science, Management, and Stewardship in a Good Anthropocene. ENVIRONMENTAL MANAGEMENT 2017; 60:165-175. [PMID: 28600638 DOI: 10.1007/s00267-017-0895-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Accepted: 05/23/2017] [Indexed: 05/24/2023]
Abstract
A new geological epoch, the "Anthropocene", has been defined as the period in which humans have had substantial geological and ecological influence on the planet. A positive future for this epoch can be referred to as the "good Anthropocene" and would involve effective management strategies and changes in human behavior that promote the sustainability and restoration of ecosystems. Recreational fisheries hold significant social, cultural, and economic value and can generate many benefits when managed sustainably and thus be an integral part of a "good Anthropocene". Here, we list ten commandments to facilitate persistence and long-term sustainability of recreational fisheries in the "good Anthropocene". This list includes fostering aquatic stewardship, promoting education, using appropriate capture gear, adopting evidence-based management approaches, promoting the concept of resilience, obtaining and using effort data in management, embracing the ecosystem approach, engaging in multilevel collaboration, enhancing accessibility, and embracing optimism. When used singly, or simultaneously, these ten commandments will contribute to the harmonization of sustainable fish populations and angling practices, to create recreational fisheries' "bright spots".
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Affiliation(s)
- Laura K Elmer
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology and Institute of Environmental Science, Carleton University, Ottawa, ON, Canada.
| | - Lisa A Kelly
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology and Institute of Environmental Science, Carleton University, Ottawa, ON, Canada
| | - Stephanie Rivest
- Department of Biology, University of Ottawa, 75 Laurier Ave E, Ottawa, ON, Canada
| | - S Clay Steell
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology and Institute of Environmental Science, Carleton University, Ottawa, ON, Canada
| | - William M Twardek
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology and Institute of Environmental Science, Carleton University, Ottawa, ON, Canada
| | - Andy J Danylchuk
- Department of Environmental Conservation, University of Massachusetts Amherst, Amherst, MA, USA
| | - Robert Arlinghaus
- Department of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries & Division of Integrative Fisheries Management, Faculty of Life Sciences & Integrative Research Institute on Transformation of Human-Environment Systems, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Joseph R Bennett
- Institute of Environmental Science and Department of Biology, Carleton University, Ottawa, ON, Canada
| | - Steven J Cooke
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology and Institute of Environmental Science, Carleton University, Ottawa, ON, Canada
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46
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Ou C, Montaña CG, Winemiller KO. Body size-trophic position relationships among fishes of the lower Mekong basin. ROYAL SOCIETY OPEN SCIENCE 2017; 4:160645. [PMID: 28280563 PMCID: PMC5319329 DOI: 10.1098/rsos.160645] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 11/23/2016] [Indexed: 06/06/2023]
Abstract
Body size is frequently claimed to be a major determinant of animal trophic interactions, yet few studies have explored relationships between body size and trophic interactions in rivers, especially within the tropics. We examined relationships between body size and trophic position (TP) within fish assemblages in four lowland rivers of the Lower Mekong Basin in Cambodia. Stable isotope analysis (based on δ15N) was used to estimate TP of common fish species in each river, and species were classified according to occupation of benthic versus pelagic habitats and major feeding guilds. Regression analysis yielded strong correlations between body size and TP among fishes from the Sesan and Sreprok rivers, but not those from the Mekong and Sekong rivers. The Mekong fish assemblage had higher average TP compared with those of other rivers. The relationship between body size and TP was positive and significantly correlated for piscivores and omnivores, but not for detritivores and insectivores. The body size-TP relationship did not differ between pelagic and benthic fishes. Body size significantly predicted TP within the orders Siluriformes and Perciformes, but not for Cypriniformes, the most species-rich and ecologically diverse order in the Lower Mekong River. We conclude that for species-rich, tropical fish assemblages with many detritivores and invertivores, body size would not be an appropriate surrogate for TP in food web models and other ecological applications.
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Affiliation(s)
- Chouly Ou
- Department of Wildlife and Fisheries Sciences, Texas A&M University, 2258 TAMU, College Station, TX 77843, USA
| | - Carmen G. Montaña
- Department of Biological Sciences, Sam Houston State University, 1900 Avenue I, Huntsville, TX 77341, USA
| | - Kirk O. Winemiller
- Department of Wildlife and Fisheries Sciences, Texas A&M University, 2258 TAMU, College Station, TX 77843, USA
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47
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Cooke SJ, Allison EH, Beard TD, Arlinghaus R, Arthington AH, Bartley DM, Cowx IG, Fuentevilla C, Leonard NJ, Lorenzen K, Lynch AJ, Nguyen VM, Youn SJ, Taylor WW, Welcomme RL. On the sustainability of inland fisheries: Finding a future for the forgotten. AMBIO 2016; 45:753-764. [PMID: 27312662 PMCID: PMC5055481 DOI: 10.1007/s13280-016-0787-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 03/02/2016] [Accepted: 04/25/2016] [Indexed: 05/19/2023]
Abstract
At present, inland fisheries are not often a national or regional governance priority and as a result, inland capture fisheries are undervalued and largely overlooked. As such they are threatened in both developing and developed countries. Indeed, due to lack of reliable data, inland fisheries have never been part of any high profile global fisheries assessment and are notably absent from the Sustainable Development Goals. The general public and policy makers are largely ignorant of the plight of freshwater ecosystems and the fish they support, as well as the ecosystem services generated by inland fisheries. This ignorance is particularly salient given that the current emphasis on the food-water-energy nexus often fails to include the important role that inland fish and fisheries play in food security and supporting livelihoods in low-income food deficit countries. Developing countries in Africa and Asia produce about 11 million tonnes of inland fish annually, 90 % of the global total. The role of inland fisheries goes beyond just kilocalories; fish provide important micronutrients and essentially fatty acids. In some regions, inland recreational fisheries are important, generating much wealth and supporting livelihoods. The following three key recommendations are necessary for action if inland fisheries are to become a part of the food-water-energy discussion: invest in improved valuation and assessment methods, build better methods to effectively govern inland fisheries (requires capacity building and incentives), and develop approaches to managing waters across sectors and scales. Moreover, if inland fisheries are recognized as important to food security, livelihoods, and human well-being, they can be more easily incorporated in regional, national, and global policies and agreements on water issues. Through these approaches, inland fisheries can be better evaluated and be more fully recognized in broader water resource and aquatic ecosystem planning and decision-making frameworks, enhancing their value and sustainability for the future.
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Affiliation(s)
- Steven J Cooke
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology and Institute of Environmental Science, Carleton University, Ottawa, ON, Canada.
| | - Edward H Allison
- School of Marine and Environmental Affairs, University of Washington, Seattle, WA, USA
| | - T Douglas Beard
- National Climate Change and Wildlife Science Center, United States Geological Survey, Reston, VA, USA
| | - Robert Arlinghaus
- Department of Biology and Ecology of Fishes, Faculty of Life Sciences, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, and Integrative Fisheries Management and Integrative Research Institute for the Transformation of Human-Environmental Systems, Humboldt-Universität zu Berlin, Berlin, Germany
| | | | - Devin M Bartley
- Fisheries and Aquaculture Department, Food and Agriculture Organization of the United Nations, Rome, Italy
| | - Ian G Cowx
- Hull International Fisheries Institute, University of Hull, Hull, UK
| | - Carlos Fuentevilla
- Fisheries and Aquaculture Department, Food and Agriculture Organization of the United Nations, Rome, Italy
| | | | - Kai Lorenzen
- Fisheries and Aquatic Sciences, School of Forest Resource and Conservation, University of Florida, Gainesville, FL, USA
| | - Abigail J Lynch
- National Climate Change and Wildlife Science Center, United States Geological Survey, Reston, VA, USA
| | - Vivian M Nguyen
- Fish Ecology and Conservation Physiology Laboratory, Department of Biology and Institute of Environmental Science, Carleton University, Ottawa, ON, Canada
| | - So-Jung Youn
- Department of Fisheries and Wildlife, Center for Systems Integration and Sustainability, East Lansing, MI, USA
| | - William W Taylor
- Department of Fisheries and Wildlife, Center for Systems Integration and Sustainability, East Lansing, MI, USA
| | - Robin L Welcomme
- Department of Life Sciences, Imperial College of London, Silwood Park, UK
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Camacho Guerreiro AI, Ladle RJ, da Silva Batista V. Riverine fishers' knowledge of extreme climatic events in the Brazilian Amazonia. JOURNAL OF ETHNOBIOLOGY AND ETHNOMEDICINE 2016; 12:50. [PMID: 27784304 PMCID: PMC5080777 DOI: 10.1186/s13002-016-0123-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Accepted: 10/15/2016] [Indexed: 05/25/2023]
Abstract
BACKGROUND Climate change is altering climate patterns, mainly increasing the frequency and intensity of extreme events with potentially serious impacts on natural resources and the people that use them. Adapting to such impacts will require the integration of scientific and local (folk) knowledge, especially the first-hand experiences and perceptions of resource users such as fishers. In this study, we identify how commercial riverine fishers in the Amazon remember extreme climatic events (flood and drought) and how they face the consequences of extreme events on fish availability. METHODS Data were collected from the main Manaus fishery harbor between June and October of 2013. Semi-structured questionnaires and a historical timeline technique were used to gather data from artisanal commercial fishers. Fishers' knowledge of extreme climate events was assessed by their "cultural consensus" for identification of event years and perceived impacts. Fishers' responses were also compared to hydrological data to test their similarity. RESULTS There was a high level of cultural consensus among fishers about extreme events years. They were able to identify four consecutive unusual droughts, between 2009 and 2012. Elevated levels of fish mortality and decreases in the fishery were perceived as consequences of the drought events, as well as, a reduction in fish size, and disappearance of some species. Extreme flood events were associated with greater difficulties accessing fishing grounds. CONCLUSIONS Extreme climatic events (floods and droughts) were remembered, and the recent increase in their intensity and frequency was also perceived. Moreover, extreme climate event (mainly droughts) impacts on fishery resources were also observed. Such information is potentially valuable for educational programs to further improve adaptation of local Amazonian fishing communities to future climate change, e.g. increasing local ecological knowledge using learning material based on their perception.
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Affiliation(s)
- Ana Isabel Camacho Guerreiro
- National Institute of Amazonian Research (INPA), Av. André Araújo, 2.936, Petrópolis. CEP 69.067.375, Manaus, AM Brazil
| | - Richard J. Ladle
- Federal University of Alagoas (UFAL), Institute of Biological and Health Sciences (ICBS), Campus A. C. Simões; Av. Lourival Melo Mota s/n, Tabuleiro dos Martins. CEP 57.072.900, Maceió, AL Brazil
- School of Geography and the Environment, University of Oxford, Oxford, UK
| | - Vandick da Silva Batista
- National Institute of Amazonian Research (INPA), Av. André Araújo, 2.936, Petrópolis. CEP 69.067.375, Manaus, AM Brazil
- Federal University of Alagoas (UFAL), Institute of Biological and Health Sciences (ICBS), Campus A. C. Simões; Av. Lourival Melo Mota s/n, Tabuleiro dos Martins. CEP 57.072.900, Maceió, AL Brazil
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Nguyen VM, Lynch AJ, Young N, Cowx IG, Beard TD, Taylor WW, Cooke SJ. To manage inland fisheries is to manage at the social-ecological watershed scale. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2016; 181:312-325. [PMID: 27376870 DOI: 10.1016/j.jenvman.2016.06.045] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 06/14/2016] [Accepted: 06/23/2016] [Indexed: 06/06/2023]
Abstract
Approaches to managing inland fisheries vary between systems and regions but are often based on large-scale marine fisheries principles and thus limited and outdated. Rarely do they adopt holistic approaches that consider the complex interplay among humans, fish, and the environment. We argue that there is an urgent need for a shift in inland fisheries management towards holistic and transdisciplinary approaches that embrace the principles of social-ecological systems at the watershed scale. The interconnectedness of inland fisheries with their associated watershed (biotic, abiotic, and humans) make them extremely complex and challenging to manage and protect. For this reason, the watershed is a logical management unit. To assist management at this scale, we propose a framework that integrates disparate concepts and management paradigms to facilitate inland fisheries management and sustainability. We contend that inland fisheries need to be managed as social-ecological watershed system (SEWS). The framework supports watershed-scale and transboundary governance to manage inland fisheries, and transdisciplinary projects and teams to ensure relevant and applicable monitoring and research. We discuss concepts of social-ecological feedback and interactions of multiple stressors and factors within/between the social-ecological systems. Moreover, we emphasize that management, monitoring, and research on inland fisheries at the watershed scale are needed to ensure long-term sustainable and resilient fisheries.
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Affiliation(s)
- Vivian M Nguyen
- Fish Ecology and Conservation Physiology Laboratory, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada.
| | - Abigail J Lynch
- U.S. Geological Survey National Climate Change and Wildlife Science Center, 12201 Sunrise Valley Drive, MS-400, Reston, VA 20192, USA.
| | - Nathan Young
- Department of Sociology and Anthropology, University of Ottawa, 120 University Private, Ottawa, ON K1N 6N5, Canada.
| | - Ian G Cowx
- Hull University, International Fisheries Institute, Hull HU6 7RX, United Kingdom.
| | - T Douglas Beard
- U.S. Geological Survey National Climate Change and Wildlife Science Center, 12201 Sunrise Valley Drive, MS-400, Reston, VA 20192, USA.
| | - William W Taylor
- Center for Systems Integration and Sustainability, Michigan State University, 1405 South Harrison Road, Suite 115 Manly Miles Building, East Lansing, MI 48823, USA.
| | - Steven J Cooke
- Fish Ecology and Conservation Physiology Laboratory, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada.
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Pinaya WHD, Lobon-Cervia FJ, Pita P, Buss de Souza R, Freire J, Isaac VJ. Multispecies Fisheries in the Lower Amazon River and Its Relationship with the Regional and Global Climate Variability. PLoS One 2016; 11:e0157050. [PMID: 27314951 PMCID: PMC4912141 DOI: 10.1371/journal.pone.0157050] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Accepted: 05/24/2016] [Indexed: 11/18/2022] Open
Abstract
This paper aims to describe the spatial-temporal variability in catch of the main fishery resources of the Amazon River and floodplain lakes of the Lower Amazon, as well as relating the Catch per Unit of Effort with anomalies of some of the Amazon River, atmosphere and Atlantic Ocean system variables, determining the influence of the environment on the Amazonian fishery resources. Finfish landings data from the towns and villages of the Lower Amazon for the fisheries of three sites (Óbidos, Santarém and Monte Alegre), were obtained for the period between January 1993 and December 2004. Analysis of variance, detrended correspondence analysis, redundancy analysis and multiple regression techniques were used for the statistical analysis of the distinct time series. Fisheries production in the Lower Amazon presents differences between the Amazon River and the floodplain lakes. Production in the Amazon River is approximately half of the one of the floodplain lakes. This variability occurs both along the Lower Amazon River region (longitudinal gradient) and laterally (latitudinal gradient) for every fishing ground studied here. The distinct environmental variables alone or in association act differently on the fishery stocks and the success of catches in each fishery group studied here. Important variables are the flooding events; the soil the sea surface temperatures; the humidity; the wind and the occurence of El Niño-Southern Oscillation events. Fishery productivity presents a large difference in quantity and distribution patterns between the river and floodplain lakes. This variability occurs in the region of the Lower Amazon as well as laterally for each fishery group studied, being dependent on the ecological characteristics and life strategies of each fish group considered here.
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Affiliation(s)
- Walter Hugo Diaz Pinaya
- Laboratory of Fisheries Biology and Management of Aquatic Resources, Federal University of Pará, Belém, Pará, Brazil
| | | | - Pablo Pita
- Department of Applied Economics, Faculty of Economics and Business Administration, University of Santiago de Compostela, Santiago de Compostela, Galicia, Spain
| | - Ronald Buss de Souza
- Laboratory of Meteorology and Satellite Oceanography, Southern Regional Center for Space Research, National Institute for Space Research, Santa Maria, Rio Grande do Sul, Brazil
| | - Juan Freire
- Grupo de Recursos Marinos y Pesquerías, Universidad de A Coruña, A Coruña, Galicia, Spain
| | - Victoria Judith Isaac
- Laboratory of Fisheries Biology and Management of Aquatic Resources, Federal University of Pará, Belém, Pará, Brazil
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