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Naziat A, Islam SMM, Chakrabarty J, Paray BA, Zahangir MM, Ando H, Shahjahan M. Elevated temperature impairs gonadal development by suppressing the expression of the genes for kisspeptin, GnRH1 and GTH subunits in Nile tilapia Oreochromis niloticus. Comp Biochem Physiol A Mol Integr Physiol 2024; 297:111714. [PMID: 39089445 DOI: 10.1016/j.cbpa.2024.111714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2024] [Revised: 07/29/2024] [Accepted: 07/29/2024] [Indexed: 08/04/2024]
Abstract
Temperature is a preeminent factor in the regulation of fish reproduction and hinders gonadal development beyond a specific threshold. To comprehend the molecular mechanism responsible for reproductive suppression at different temperature, expression of the genes encoding kisspeptin (kiss2), gonadotropin-releasing hormone (gnrh1) and their receptors (gpr54, gnrh1r) in the brain, and the gonadotropin (GTH) subunits (fshb and lhb) in the pituitary were studied in juvenile Nile tilapia (Oreochromis niloticus) along with gonadal histology. Fish were acclimatized to three distinct temperatures, including 31 °C, 34 °C and 37 °C for 14 days. The mRNA levels of kiss2, gpr54, gnrh1, and gnrh1r were significantly decreased at 37 °C compared to 31 °C and 34 °C in the both sexes. In parallel, the expression level of fshb in the both sexes and lhb in the female were significantly lower at 37 °C in the pituitary. Histologically, the gonads of both sexes had normal growth of gametes at control temperature (31 °C), whereas the spermatogenesis and oocyte maturation were slowed down and atretic oocytes were found in the ovary at 37 °C acclimation temperature. Taken together, the results imply that elevated temperature beyond the specific threshold may have a negative impact on reproduction by suppressing the gene expressions of kisspeptin/GnRH1/GTH system and eventually restrains normal growth and maturation of gametes in the both sexes of Nile tilapia.
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Affiliation(s)
- Azmaien Naziat
- Department of Fish Biology and Biotechnology, Chattogram Veterinary and Animal Sciences University, Chattogram 4225, Bangladesh
| | - S M Majharul Islam
- Laboratory of Fish Ecophysiology, Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
| | - Joya Chakrabarty
- Department of Fish Biology and Biotechnology, Chattogram Veterinary and Animal Sciences University, Chattogram 4225, Bangladesh
| | - Bilal Ahamad Paray
- Department of Zoology, College of Science, King Saud University, PO Box 2455, Riyadh 11451, Saudi Arabia
| | - Md Mahiuddin Zahangir
- Department of Fish Biology and Biotechnology, Chattogram Veterinary and Animal Sciences University, Chattogram 4225, Bangladesh
| | - Hironori Ando
- Marine Biological Station, Sado Island Center for Ecological Sustainability, Niigata University, Sado, Niigata 952-2135, Japan
| | - Md Shahjahan
- Laboratory of Fish Ecophysiology, Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh.
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Souza VVD, Moreira DP, Braz-Mota S, Valente W, Cotta GC, Rodrigues MDS, Nóbrega RH, Corrêa RDS, Hoyos DCDM, Sanches EA, Val AL, Lacerda SMDSN. Simulated climate change and atrazine contamination can synergistically impair zebrafish testicular function. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 946:174173. [PMID: 38925398 DOI: 10.1016/j.scitotenv.2024.174173] [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: 10/17/2023] [Revised: 05/25/2024] [Accepted: 06/19/2024] [Indexed: 06/28/2024]
Abstract
Elements that interfere with reproductive processes can have profound impacts on population and the equilibrium of ecosystems. Global warming represents the major environmental challenge of the 21st century, as it will affect all forms of life in the coming decades. Another coexisting concern is the persistent pollution by pesticides, particularly the herbicide Atrazine (ATZ), which is responsible for a significant number of contamination incidents in surface waters worldwide. While it is hypothesized that climate changes will significantly enhance the toxic effects of pesticides, the actual impact of these phenomena remain largely unexplored. Here, we conducted a climate-controlled room experiment to assess the interactive effects of the projected 2100 climate scenario and environmentally realistic ATZ exposures on the reproductive function of male zebrafish. The gonadosomatic index significantly decreased in fish kept in the extreme scenario. Cellular alterations across spermatogenesis phases led to synergic decreased sperm production and increased germ cell sloughing and death. ATZ exposure alone or combined with climate change effects, disrupted the transcription levels of key genes involved in steroidogenesis, hormone signaling and spermatogenesis regulation. An additive modulation with decreased 11-KT production and increased E2 levels was also evidenced, intensifying the effects of androgen/estrogen imbalance. Moreover, climate change and ATZ independently induced oxidative stress, upregulation of proapoptotic gene and DNA damage in post-meiotic germ cell, but the negative effects of ATZ were greater at extreme scenario. Ultimately, exposure to simulated climate changes severely impaired fertilization capacity, due to a drastic reduction in sperm motility and/or viability. These findings indicate that the future climate conditions have the potential to considerably enhance the toxicity of ATZ at low concentrations, leading to significant deleterious consequences for fish reproductive function and fertility. These may provide relevant information to supporting healthcare and environmental managers in decision-making related to climate changes and herbicide regulation.
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Affiliation(s)
- Victor Ventura de Souza
- Laboratory of Cellular Biology, Department of Morphology, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Davidson Peruci Moreira
- Laboratory of Ichthiohistology, Department of Morphology, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Susana Braz-Mota
- Laboratory of Ecophysiology and Molecular Evolution, Brazilian National Institute for Research in the Amazon, Manaus, Amazonas, Brazil
| | - Wanderson Valente
- Laboratory of Cellular Biology, Department of Morphology, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Gustavo Caldeira Cotta
- Laboratory of Cellular Biology, Department of Morphology, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Maira da Silva Rodrigues
- Reproductive and Molecular Biology Group, Department of Structural and Functional Biology, Institute of Biosciences, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil
| | - Rafael Henrique Nóbrega
- Reproductive and Molecular Biology Group, Department of Structural and Functional Biology, Institute of Biosciences, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil
| | - Rebeca Dias Serafim Corrêa
- Laboratory of Cellular Biology, Department of Morphology, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | | | - Eduardo Antônio Sanches
- Faculty of Agricultural Sciences of Vale do Ribeira, São Paulo State University (UNESP), Brazil
| | - Adalberto Luís Val
- Laboratory of Ecophysiology and Molecular Evolution, Brazilian National Institute for Research in the Amazon, Manaus, Amazonas, Brazil
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Xu L, Wang Y, Lin S, Li H, Qi P, Buttino I, Wang W, Guo B. Insights into the Response in Digestive Gland of Mytilus coruscus under Heat Stress Using TMT-Based Proteomics. Animals (Basel) 2023; 13:2248. [PMID: 37508026 PMCID: PMC10376264 DOI: 10.3390/ani13142248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 06/30/2023] [Accepted: 06/30/2023] [Indexed: 07/30/2023] Open
Abstract
Ocean warming can cause injury and death in mussels and is believed to be one of the main reasons for extensive die-offs of mussel populations worldwide. However, the biological processes by which mussels respond to heat stress are still unclear. In this study, we conducted an analysis of enzyme activity and TMT-labelled based proteomic in the digestive gland tissue of Mytilus coruscus after exposure to high temperatures. Our results showed that the activities of superoxide dismutase, acid phosphatase, lactate dehydrogenase, and cellular content of lysozyme were significantly changed in response to heat stress. Furthermore, many differentially expressed proteins involved in nutrient digestion and absorption, p53, MAPK, apoptosis, and energy metabolism were activated post-heat stress. These results suggest that M. coruscus can respond to heat stress through the antioxidant system, the immune system, and anaerobic respiration. Additionally, M. coruscus may use fat, leucine, and isoleucine to meet energy requirements under high temperature stress via the TCA cycle pathway. These findings provide a useful reference for further exploration of the response mechanism to heat stress in marine mollusks.
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Affiliation(s)
- Lezhong Xu
- National Engineering Research Center for Marine Aquaculture, Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316022, China
| | - Yuxia Wang
- National Engineering Research Center for Marine Aquaculture, Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316022, China
| | - Shuangrui Lin
- National Engineering Research Center for Marine Aquaculture, Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316022, China
| | - Hongfei Li
- National Engineering Research Center for Marine Aquaculture, Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316022, China
| | - Pengzhi Qi
- National Engineering Research Center for Marine Aquaculture, Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316022, China
| | - Isabella Buttino
- Italian Institute for Environmental Protection and Research ISPRA, Via del Cedro n.38, 57122 Livorno, Italy
| | - Weifeng Wang
- National Engineering Research Center for Marine Aquaculture, Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316022, China
| | - Baoying Guo
- National Engineering Research Center for Marine Aquaculture, Marine Science and Technology College, Zhejiang Ocean University, Zhoushan 316022, China
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Chen H, Chen J, Wu Y, Xie W, Jin L. A study on the mechanism of Indium phosphide/zinc sulfide core/shell quantum dots influencing embryo incubation of rare minnow (Gobiocypris rarus). AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2023; 261:106593. [PMID: 37327537 DOI: 10.1016/j.aquatox.2023.106593] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 05/13/2023] [Accepted: 05/25/2023] [Indexed: 06/18/2023]
Abstract
Quantum dots (QDs) inhibit fish hatching, but the mechanism is still unclear. In this study, the effect of Indium phosphide/zinc sulfide quantum dots (InP/ZnS QDs) on the embryo incubation of rare minnow was investigated. Five experimental concentration groups were set up according to the preliminary experimental results, which were 0, 50, 100, 200 and 400 nM. A direct exposure method was adopted to expose embryos to InP/ZnS QDs solution. The results showed that InP/ZnS QDs significantly inhibited the embryo hatching rate, delayed embryo emergence, affected the expression of genes associated with hatching gland cells and hatching enzymes. InP/ZnS QDs also destroy the structure of the embryo chorion. In addition, QDs can cause oxidative stress in embryos. Transcriptional sequencing analysis showed that InP/ZnS QDs InP/ZnS QDs may have induced the production of a hypoxic environment and triggered induce abnormal cardiac muscle contraction, inflammatory response and apoptosis process in embryos. In conclusion, QDs influences embryo hatchability largely through egg chorion mediation.
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Affiliation(s)
- Hang Chen
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Southwest University School of Life Sciences, Chongqing, 400715, China
| | - Juan Chen
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Southwest University School of Life Sciences, Chongqing, 400715, China
| | - Yingyi Wu
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Southwest University School of Life Sciences, Chongqing, 400715, China
| | - Weiwei Xie
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Southwest University School of Life Sciences, Chongqing, 400715, China
| | - Li Jin
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Southwest University School of Life Sciences, Chongqing, 400715, China.
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Surrogate production of genome-edited sperm from a different subfamily by spermatogonial stem cell transplantation. SCIENCE CHINA-LIFE SCIENCES 2021; 65:969-987. [PMID: 34586576 DOI: 10.1007/s11427-021-1989-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 08/10/2021] [Indexed: 12/25/2022]
Abstract
The surrogate reproduction technique, such as inter-specific spermatogonial stem cells (SSCs) transplantation (SSCT), provides a powerful tool for production of gametes derived from endangered species or those with desirable traits. However, generation of genome-edited gametes from a different species or production of gametes from a phylogenetically distant species such as from a different subfamily, by SSCT, has not succeeded. Here, using two small cyprinid fishes from different subfamilies, Chinese rare minnow (gobiocypris rarus, for brief: Gr) and zebrafish (danio rerio), we successfully obtained Gr-derived genome-edited sperm in zebrafish by an optimized SSCT procedure. The transplanted Gr SSCs supported the host gonadal development and underwent normal spermatogenesis, resulting in a reconstructed fertile testis containing Gr spermatids and zebrafish testicular somatic cells. Interestingly, the surrogate spermatozoa resembled those of host zebrafish but not donor Gr in morphology and swimming behavior. When pou5f3 and chd knockout Gr SSCs were transplanted, Gr-derived genome-edited sperm was successfully produced in zebrafish. This is the first report demonstrating surrogate production of gametes from a different subfamily by SSCT, and surrogate production of genome-edited gametes from another species as well. This method is feasible to be applied to future breeding of commercial fish and livestock.
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Postingel Quirino P, da Silva Rodrigues M, da Silva Cabral EM, de Siqueira-Silva DH, Mori RH, Butzge AJ, Nóbrega RH, Ninhaus-Silveira A, Veríssimo-Silveira R. The influence of increased water temperature on the duration of spermatogenesis in a neotropical fish, Astyanax altiparanae (Characiformes, Characidae). FISH PHYSIOLOGY AND BIOCHEMISTRY 2021; 47:747-755. [PMID: 32889598 DOI: 10.1007/s10695-020-00869-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Accepted: 08/28/2020] [Indexed: 06/11/2023]
Abstract
In view of the established climate change scenario and the consequent changes in global temperature, it is essential to study its effects on animal spermatogenesis. Therefore, the aim of this study was to verify the duration of spermatogenesis at different temperatures. For this purpose, 96 male and adult specimens of Astyanax altiparanae were kept in a closed circulation system with water temperature stabilized at 27 °C and 32 °C. Subsequently, the specimens received pulses of BrdU (bromodeoxyuridine) at a concentration of 100 mg/kg/day for 2 consecutive days, and the samples were collected daily for a period of 15 days. Their testes were removed, fixed, processed in historesin, and sectioned in 3 μm, submitted to hematoxylin/eosin staining and to bromodeoxyuridine immunodetection. Partial results of the optimum temperature experiments allowed the classification of A. altiparanae spermatogenic cells in Aund, Adiff, and type B spermatogonia, spermatocytes, spermatids, and spermatozoa. The duration of spermatogenesis was determined as approximately 6 days for animals at a temperature of 27 °C and 1 day for animals at 32 °C. The elevated temperature was also responsible for increasing cell proliferation, resulting in an increase in the number of spermatocytes, spermatids, spermatozoa, and cell death (cell pyknotic). The duration of spermatogenesis in A. altiparanae was directly affected by the elevated water temperature, causing a reduction in the estimated time of spermatogenesis.
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Affiliation(s)
- Patricia Postingel Quirino
- Departamento de Biologia e Zootecnia. L.I.NEO - Laboratory of Neotropical Ichthyology, UNESP - Universidade Estadual Paulista "Júlio de Mesquita Filho", Câmpus de Ilha Solteira, Rua Monção, n 226, 15385-000, Ilha Solteira, São Paulo, Brazil.
- Programa de Pós-Graduação em Ciências Biológicas (Zoologia), Instituto de Biociências de Botucatu (UNESP - IBB), R. Prof. Dr. Antonio Celso Wagner Zanin, 250, 18618-689, Botucatu, São Paulo, Brazil.
| | - Maira da Silva Rodrigues
- Departamento de Biologia e Zootecnia. L.I.NEO - Laboratory of Neotropical Ichthyology, UNESP - Universidade Estadual Paulista "Júlio de Mesquita Filho", Câmpus de Ilha Solteira, Rua Monção, n 226, 15385-000, Ilha Solteira, São Paulo, Brazil
| | - Elis Marina da Silva Cabral
- Departamento de Biologia e Zootecnia. L.I.NEO - Laboratory of Neotropical Ichthyology, UNESP - Universidade Estadual Paulista "Júlio de Mesquita Filho", Câmpus de Ilha Solteira, Rua Monção, n 226, 15385-000, Ilha Solteira, São Paulo, Brazil
| | - Diógenes Henrique de Siqueira-Silva
- Instituto de Estudo em Saúde e Biologicas (IESB), Research Group of Reproduction on Amazon Fish (GERPA/LaNec), UNIFESSPA - Universidade Federal do Sul e Sudeste do Para, Folha 31, Quadra 07, Lote especial s/n, 68.507-590, Marabá, Brazil
| | - Ricardo Hideo Mori
- Departamento de Biologia e Zootecnia. L.I.NEO - Laboratory of Neotropical Ichthyology, UNESP - Universidade Estadual Paulista "Júlio de Mesquita Filho", Câmpus de Ilha Solteira, Rua Monção, n 226, 15385-000, Ilha Solteira, São Paulo, Brazil
| | - Arno Juliano Butzge
- Departamento de Morfologia, Reproductive and Molecular Biology Group, UNESP - Universidade Estadual Paulista "Júlio de Mesquita Filho", Câmpus de Botucatu, Instituto de Biociências de Botucatu, R. Prof.Dr. Antonio Celso Wagner Zanin, 250, 18618-689, Botucatu, São Paulo, Brazil
| | - Rafael Henrique Nóbrega
- Departamento de Morfologia, Reproductive and Molecular Biology Group, UNESP - Universidade Estadual Paulista "Júlio de Mesquita Filho", Câmpus de Botucatu, Instituto de Biociências de Botucatu, R. Prof.Dr. Antonio Celso Wagner Zanin, 250, 18618-689, Botucatu, São Paulo, Brazil
| | - Alexandre Ninhaus-Silveira
- Departamento de Biologia e Zootecnia. L.I.NEO - Laboratory of Neotropical Ichthyology, UNESP - Universidade Estadual Paulista "Júlio de Mesquita Filho", Câmpus de Ilha Solteira, Rua Monção, n 226, 15385-000, Ilha Solteira, São Paulo, Brazil
| | - Rosicleire Veríssimo-Silveira
- Departamento de Biologia e Zootecnia. L.I.NEO - Laboratory of Neotropical Ichthyology, UNESP - Universidade Estadual Paulista "Júlio de Mesquita Filho", Câmpus de Ilha Solteira, Rua Monção, n 226, 15385-000, Ilha Solteira, São Paulo, Brazil.
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Alix M, Kjesbu OS, Anderson KC. From gametogenesis to spawning: How climate-driven warming affects teleost reproductive biology. JOURNAL OF FISH BIOLOGY 2020; 97:607-632. [PMID: 32564350 DOI: 10.1111/jfb.14439] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 06/05/2020] [Accepted: 06/18/2020] [Indexed: 05/17/2023]
Abstract
Ambient temperature modulates reproductive processes, especially in poikilotherms such as teleosts. Consequently, global warming is expected to impact the reproductive function of fish, which has implications for wild population dynamics, fisheries and aquaculture. In this extensive review spanning tropical and cold-water environments, we examine the impact of higher-than-optimal temperatures on teleost reproductive development and physiology across reproductive stages, species, generations and sexes. In doing so, we demonstrate that warmer-than-optimal temperatures can affect every stage of reproductive development from puberty through to the act of spawning, and these responses are mediated by age at spawning and are associated with changes in physiology at multiple levels of the brain-pituitary-gonad axis. Response to temperature is often species-specific and changes with environmental history/transgenerational conditioning, and the amplitude, timing and duration of thermal exposure within a generation. Thermally driven changes to physiology, gamete development and maturation typically culminate in poor sperm and oocyte quality, and/or advancement/delay/inhibition of ovulation/spermiation and spawning. Although the field of teleost reproduction and temperature is advanced in many respects, we identify areas where research is lacking, especially for males and egg quality from "omics" perspectives. Climate-driven warming will continue to disturb teleost reproductive performance and therefore guide future research, especially in the emerging areas of transgenerational acclimation and epigenetic studies, which will help to understand and project climate change impacts on wild populations and could also have implications for aquaculture.
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Affiliation(s)
- Maud Alix
- Institute of Marine Research, Bergen, Norway
| | | | - Kelli C Anderson
- Institute for Marine and Antarctic Studies, University of Tasmania Newnham Campus, Newnham, Tasmania, Australia
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The Reproductive Strategy of the Rare Minnow ( Gobiocypris rarus) in Response to Starvation Stress. Zool Stud 2020; 59:e1. [PMID: 32095165 DOI: 10.6620/zs.2020.59-01] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Accepted: 12/27/2019] [Indexed: 11/18/2022]
Abstract
Food abundance plays an important role in the reproduction of fish, especially multiple spawners. Multiple spawners can exhibit various biological strategies when under starvation stress. However, the reproductive strategy used in these fish species remains unknown. To explore whether rare minnows (Gobiocypris rarus) prioritize survival over current reproduction under starvation conditions, paired adult rare minnows were starved for 0, 5, 10, 15 d and their spawning activities were recorded. Anatomical and histological characteristics of unpaired adult rare minnows were examined during starvation and following re-feeding. It was found that only 30-70% of paired rare minnows spawned within 5 d after deprivation of food. Though spawning activity was suppressed by starvation, rare minnows starved for 0, 5, 10, and 15 d waited 3.89 ± 0.78 d, 5.57 ± 3.36 d, 5.83 ± 5.15 d and 6.57 ± 4.50 d, respectively, after re-feeding to resume spawning. The average inter-spawning interval and length until egg production of those starved for 15 d was 4.60 ± 2.37 d and 139.1 ± 67.9 d, respectively, when they spawned with rhythm, which were significantly different from those starved for 0 d (P < 0.05). Anatomical and histological data further revealed that late maturing oocytes degraded after 8 d of starvation, but the gonadosomatic index recovered to initial levels after 8 d of re-feeding. Thus, reproduction of rare minnows was markedly affected by starvation, but rapidly returned to normal upon re-feeding. These observations demonstrated that paired rare minnows prioritize survival by channeling energy from the liver and absorbing late maturing oocytes instead of continuing to reproduce under food deprivation condition.
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Delgado GA, Glazer RA, Brown-Peterson NJ. Arrested Sexual Development in Queen Conch ( Lobatus gigas) Linked to Abnormalities in the Cerebral Ganglia. THE BIOLOGICAL BULLETIN 2019; 237:241-249. [PMID: 31922908 DOI: 10.1086/706494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In the Florida Keys, queen conchs (Lobatus gigas) occur in two spatially distinct regions: nearshore in habitats immediately adjacent to the shoreline and offshore in habitats along the reef tract south of the islands. Our previous research demonstrated that adult conchs nearshore are not reproductively active, showing deficiencies in their gonadal condition compared to their offshore counterparts. Because sexual development in gastropods is controlled by hormones secreted by the cerebral ganglia, we hypothesized that the reproductive deficiencies seen in nearshore queen conchs involved the cerebral ganglia. We collected nearshore and offshore adults and made histological comparisons of their gonads and cerebral ganglia. Our results confirmed that gonadal maturity was delayed and that gamete production was reduced in nearshore conchs compared to offshore animals. These gonadal deficiencies in nearshore conchs were associated with abnormal cerebral ganglion histology (i.e., significant hypertrophy of ganglion cells and significantly lower density of ganglion cells). In addition, the shells of nearshore conchs were significantly lighter, which is particularly consequential because shell formation in gastropods is also mediated by hormones secreted by the cerebral ganglia. Given these results, it is apparent that some yet unidentified factor(s) is interfering with hormone production in the cerebral ganglia, to the detriment of gonad development and shell formation.
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10
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Hani YMI, Turies C, Palluel O, Delahaut L, Bado-Nilles A, Geffard A, Dedourge-Geffard O, Porcher JM. Effects of a chronic exposure to different water temperatures and/or to an environmental cadmium concentration on the reproduction of the threespine stickleback (Gasterosteus aculeatus). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 174:48-57. [PMID: 30818260 DOI: 10.1016/j.ecoenv.2019.02.032] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 01/17/2019] [Accepted: 02/11/2019] [Indexed: 05/12/2023]
Abstract
Knowledge about combined effects of chemicals and temperature on reproductive capacity of fish are rare in literature, especially when it comes to the effects of chronic low-dose chemical exposure combined to the thermal stress. The aim of the study was to evaluate the single and combined effects of temperature (16, 18, 21 °C) and an environmentally relevant concentration of waterborne cadmium (1 µg L-1, nominal concentration) on the reproductive outputs of threespine stickleback (Gasterosteus aculeatus), and their consequences on offspring survival parameters. The high temperature (21 °C) was the only factor that affected parental parameters (gonadosomatic index "GSI", and vitellogenin "VTG" particularly). On females, 21 °C had a stimulating effect on gonadal development evaluated by an early increase, followed by a sharp decrease of GSI, probably indicating gonadal atresia. Promoting effect of temperature was corroborated by an early production of VTG. In vitro fertilization assays showed interesting results, particularly cadmium effects. As it was supposed, high temperature had a negative impact on offspring parameters (significant decrease in survival and an increase of unhatched embryos). Parental exposure to the very low concentration of cadmium had also negative consequences on mortality rate (significant increase) and hatching rate (significant decrease). Our results indicate that in a global warming context, high temperature and its combination with contaminant may impact reproductive capacity of G. aculeatus, by decreasing parental investment (low eggs and/or sperm quality).
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Affiliation(s)
- Younes Mohamed Ismail Hani
- Institut National de l'Environnement Industriel et des Risques (INERIS), UMR-I 02 SEBIO (Stress Environnementaux et Biosurveillance des milieux aquatiques), Verneuil-en-Halatte, France; Université de Reims Champagne-Ardenne (URCA), UMR-I 02 SEBIO (Stress Environnementaux et Biosurveillance des milieux aquatiques), Moulin de la Housse, Reims, France.
| | - Cyril Turies
- Institut National de l'Environnement Industriel et des Risques (INERIS), UMR-I 02 SEBIO (Stress Environnementaux et Biosurveillance des milieux aquatiques), Verneuil-en-Halatte, France
| | - Olivier Palluel
- Institut National de l'Environnement Industriel et des Risques (INERIS), UMR-I 02 SEBIO (Stress Environnementaux et Biosurveillance des milieux aquatiques), Verneuil-en-Halatte, France
| | - Laurence Delahaut
- Université de Reims Champagne-Ardenne (URCA), UMR-I 02 SEBIO (Stress Environnementaux et Biosurveillance des milieux aquatiques), Moulin de la Housse, Reims, France
| | - Anne Bado-Nilles
- Institut National de l'Environnement Industriel et des Risques (INERIS), UMR-I 02 SEBIO (Stress Environnementaux et Biosurveillance des milieux aquatiques), Verneuil-en-Halatte, France
| | - Alain Geffard
- Université de Reims Champagne-Ardenne (URCA), UMR-I 02 SEBIO (Stress Environnementaux et Biosurveillance des milieux aquatiques), Moulin de la Housse, Reims, France
| | - Odile Dedourge-Geffard
- Université de Reims Champagne-Ardenne (URCA), UMR-I 02 SEBIO (Stress Environnementaux et Biosurveillance des milieux aquatiques), Moulin de la Housse, Reims, France
| | - Jean-Marc Porcher
- Institut National de l'Environnement Industriel et des Risques (INERIS), UMR-I 02 SEBIO (Stress Environnementaux et Biosurveillance des milieux aquatiques), Verneuil-en-Halatte, France
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