Abstract
In order to assess the effects of increasing temperature on the reproductive performance of fish, different thermal conditions (i.e., 25.0, 26.5, 27.5, 28.5, 30.0 °C) were used in this study and the self-fertilizing hermaphrodite fish, Kryptolebias marmoratus, was exposed to these different thermal conditions. During an exposure period of 30 to 150 days, the gonadosomatic index (GSI), gonadal development, the levels of plasma 17β-estradial (E2) and testosterone (T), hepatic vitellogenin (VTG) mRNA abundance, and the number of self-fertilized eggs were analyzed. This study confirmed that a high water temperature above 27.5 °C led to the suppression of self-fertility of hermaphroditic fish from 30 days after exposure. The oocyte quality and maturation would be affected by the disruption of hepatic VTG synthesis at a high water temperature of 30 °C, which resulted in the reduced the self-fertility in K. marmoratus. Consequently, this study suggests that elevated water temperature due to aquatic climate change prior to sexual maturation and the onset of spawning can lead to the reproductive dysfunction of hermaphroditic K. marmoratus.
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Acknowledgments
We would like to thank Mr. Toshiaki Ura for the accumulation of data in this study and the Environmental Safety Group in KIST Europe for helpful comments that greatly improved earlier drafts of the manuscript.
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The effects induced by elevated temperature due to aquatic climate change on the reproductive performance in the hermaphrodite fish
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All authors contributed to conception and design of the experiments. All the authors have given their approval to the final version of the manuscript.
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This work was partly co-funded by a grant from the Research Fellowships of the Japan Society for the Promotion of Science (JSPS) for Young Scientists (grant no. 20·10848).
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Park, CB., Kim, Y.J. & Soyano, K. Effects of increasing temperature due to aquatic climate change on the self-fertility and the sexual development of the hermaphrodite fish, Kryptolebias marmoratus . Environ Sci Pollut Res 24, 1484–1494 (2017). https://doi.org/10.1007/s11356-016-7878-4
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DOI: https://doi.org/10.1007/s11356-016-7878-4