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Hadj-Hammou J, Cinner JE, Barneche DR, Caldwell IR, Mouillot D, Robinson JPW, Schiettekatte NMD, Siqueira AC, Taylor BM, Graham NAJ. Global patterns and drivers of fish reproductive potential on coral reefs. Nat Commun 2024; 15:6105. [PMID: 39030209 PMCID: PMC11271586 DOI: 10.1038/s41467-024-50367-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 07/09/2024] [Indexed: 07/21/2024] Open
Abstract
Fish fecundity scales hyperallometrically with body mass, meaning larger females produce disproportionately more eggs than smaller ones. We explore this relationship beyond the species-level to estimate the "reproductive potential" of 1633 coral reef sites distributed globally. We find that, at the site-level, reproductive potential scales hyperallometrically with assemblage biomass, but with a smaller median exponent than at the species-level. Across all families, modelled reproductive potential is greater in fully protected sites versus fished sites. This difference is most pronounced for the important fisheries family, Serranidae. When comparing a scenario where 30% of sites are randomly fully protected to a current protection scenario, we estimate an increase in the reproductive potential of all families, and particularly for Serranidae. Such results point to the possible ecological benefits of the 30 × 30 global conservation target and showcase management options to promote the sustainability of population replenishment.
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Affiliation(s)
- Jeneen Hadj-Hammou
- Lancaster University Environment Centre, Lancaster University, Lancaster, UK.
| | - Joshua E Cinner
- Thriving Oceans Research Hub. School of Geosciences, University of Sydney, Caperdown, NSW, 2006, Australia
| | - Diego R Barneche
- Australian Institute of Marine Science, Crawley, WA, Australia
- Oceans Institute, The University of Western Australia, Crawley, WA, Australia
| | - Iain R Caldwell
- College of Arts, Society and Education, James Cook University, Townsville, QLD, Australia
| | - David Mouillot
- MARBEC, Univ Montpellier, CNRS, IRD, Ifremer, Montpellier, France
| | - James P W Robinson
- Lancaster University Environment Centre, Lancaster University, Lancaster, UK
| | | | - Alexandre C Siqueira
- Centre for Marine Ecosystems Research, School of Science, Edith Cowan University, Perth, WA, 6027, Australia
- Research Hub for Coral Reef Ecosystem Functions, College of Science and Engineering, James Cook University, Townsville, QLD, 4811, Australia
| | - Brett M Taylor
- University of Guam Marine Laboratory and UOG Sea Grant, 303 University Drive, UOG Station, Mangilao, Guam, 96923, USA
| | - Nicholas A J Graham
- Lancaster University Environment Centre, Lancaster University, Lancaster, UK
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He J, Wu Z, Huang L, Sun Y, Wang D, Lin Y, He A, Feng J, Liu H. Age, growth, reproduction and status of resource development of Ptychidio jordani, a critically endangered freshwater fish in the Hongshui River, China. JOURNAL OF FISH BIOLOGY 2024; 104:399-409. [PMID: 36648015 DOI: 10.1111/jfb.15324] [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: 10/28/2022] [Accepted: 01/14/2023] [Indexed: 06/17/2023]
Abstract
The age, growth, reproduction and resource development status of Ptychidio jordani, as a critically endangered freshwater fish in the Hongshui River, China, was studied in this work. A total of 525 specimens were collected monthly using the cages and gillnets from October 2021 to September 2022 in the Hongshui River. The scale was used for age determination, and the maximum age for both female and male was estimated to be 5 years and 3 years, respectively. Female and male P. jordani showed different growth patterns, which were expressed as Lt = 261.3 (1-e-0.4885(t-0.1476) ) and Lt = 251.2 (1-e-0.4758(t+0.9643) ), respectively. The overall sex ratio was 1:0.47 (female:male). Female attained sex maturity at 2.34 years (192 mm body length). Month variation of the gonad somatic index indicated that the spawning period occurred from April to October. The absolute fecundity was estimated at 9046 ± 3434 eggs per individual, and the relative fecundity was 38.08 ± 15.77 eggs per gram. The exploitation rate of female and male was 0.233 and 0.495, which indicated that P. jordani was not overfishing. This study provided data on the key life-history traits of P. jordani, which has not been known previously and is essential for conservation strategy and policy development.
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Affiliation(s)
- Jiayang He
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, China
| | - Zhiqiang Wu
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, China
| | - Liangliang Huang
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, China
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, China
- Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety Guarantee in Karst Areas, Guilin University of Technology, Guilin, China
| | - Yangyan Sun
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, China
| | - Dongjie Wang
- College of Marine Sciences, South China Agricultural University, Guangzhou, China
| | - Yong Lin
- Guangxi Academy of Fishery Sciences, Nanning, China
| | - Anyou He
- Guangxi Academy of Fishery Sciences, Nanning, China
| | - Jie Feng
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, China
| | - Hao Liu
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, China
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He Z, Gao K, Chen H, Yang D, Pu Y, Zheng L, Jiao Y, Xiong J, Chen Q, Lai B, Zhang M, Tang Z, Yan T. Comparative Population Dynamics of Schizothorax wangchiachii (Cyprinidae: Schizothoracinae) in the Middle Reaches of the Yalong River and the Upper Reaches of the Jinsha River, China. Animals (Basel) 2023; 13:2209. [PMID: 37444008 DOI: 10.3390/ani13132209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 07/03/2023] [Accepted: 07/03/2023] [Indexed: 07/15/2023] Open
Abstract
To explore the differences in the growth characteristics and population dynamics of Schizothorax wangchiachii populations in the Jinsha River (JSR) and the Yalong River (YLR), samples were collected in the upper reaches of the JSR (n = 230) from 2019 to 2020 and the middle reaches of the YLR (n = 187) from 2017 to 2018. In the JSR and YLR populations, the age range was 11 and 12 years old, respectively, and the best growth equation was the Von Bertalanffy equation. The comparative analysis of the two populations showed that the growth coefficient, initial sexual maturity age and age at first capture of the YLR population were greater than those of the JSR population. Comparing the mortality rates of the two groups, we found that the YLR population had the higher female mortality rate (0.658 years-1) and the lower male mortality rate (0.453 years-1). Our assessment of the three natural mortality rates showed that the Fcur of both male and female populations was greater than F25%, indicating that both populations were in an overexploited state. Therefore, we suggest considering the two groups as separate protection units and implementing management measures such as ecological regulation, restoration of tributary habitat and strengthening of fishing ban monitoring to protect their resources.
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Affiliation(s)
- Zhi He
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China
| | - Kuo Gao
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China
| | - Hongjun Chen
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China
| | - Deying Yang
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China
| | - Yong Pu
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China
| | - Li Zheng
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China
| | - Yuanyuan Jiao
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China
| | - Jinxin Xiong
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China
| | - Qiqi Chen
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China
| | - Bolin Lai
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China
| | - Mingwang Zhang
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China
| | - Ziting Tang
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China
| | - Taiming Yan
- College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China
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Smart JJ, Grammer GL. Modernising fish and shark growth curves with Bayesian length-at-age models. PLoS One 2021; 16:e0246734. [PMID: 33556124 PMCID: PMC7870076 DOI: 10.1371/journal.pone.0246734] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Accepted: 01/25/2021] [Indexed: 11/18/2022] Open
Abstract
Growth modelling is a fundamental component of fisheries assessments but is often hindered by poor quality data from biased sampling. Several methods have attempted to account for sample bias in growth analyses. However, in many cases this bias is not overcome, especially when large individuals are under-sampled. In growth models, two key parameters have a direct biological interpretation: L0, which should correspond to length-at-birth and L∞, which should approximate the average length of full-grown individuals. Here, we present an approach of fitting Bayesian growth models using Markov Chain Monte Carlo (MCMC), with informative priors on these parameters to improve the biological plausibility of growth estimates. A generalised framework is provided in an R package 'BayesGrowth', which removes the hurdle of programming an MCMC model for new users. Four case studies representing different sampling scenarios as well as three simulations with different selectivity functions were used to compare this Bayesian framework to standard frequentist growth models. The Bayesian models either outperformed or matched the results of frequentist growth models in all examples, demonstrating the broad benefits offered by this approach. This study highlights the impact that Bayesian models could provide in age and growth studies if applied more routinely rather than being limited to only complex or sophisticated applications.
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Affiliation(s)
- Jonathan J. Smart
- SARDI Aquatic Sciences, West Beach, SA, Australia
- School of Biological Sciences, The University of Adelaide, Adelaide, South Australia, Australia
| | - Gretchen L. Grammer
- SARDI Aquatic Sciences, West Beach, SA, Australia
- School of Biological Sciences, The University of Adelaide, Adelaide, South Australia, Australia
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