Abstract
During migration, anadromous fish may encounter the effects of temperature and salinity of the water. In this study, we examined the effects of cold stress (25, 21, 17, and 13 °C) and salinity stress (20, 10, and 0 ‰) on morphology, enzyme activity, and gene expression level in the gills sampled from river pufferfish (Takifugu fasciatus). This environmental bifactor stress experiment suggested that the activities of catalase, glutathione peroxidase and total superoxide dismutase, as well as the expression of the sod2, hsp90, and cirp genes, increased with decreasing temperature. Among them, cirp reached its peak expression level before individuals experienced the lowest temperature. The osmosis-related genes nka, ncc, nkcc and cftr, all showed an increasing trend with increasing salinity and decreasing temperature. When cold and salinity stress were enhanced, apoptosis-related genes bcl-2, caspase-3 and caspase-9 promoted apoptosis through downregulation, up-regulation, and up-regulation, respectively. The study of the gill morphology showed that an increase in salinity or a decrease in temperature mainly leads to serious vacuolar lesions in the gill filaments. The results also showed moderate salinity (10 ‰) may alleviate the gill stress responses caused by low temperature. This research exhibited the primary molecular responses of the anadromous fish T. fasciatus under cold and salinity challenges, which could serve as a valuable reference for studying the responses of migratory fish to environmental changes.
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The data sets during the current study are available from the corresponding author on reasonable request.
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The authors thank all members of the laboratory for valuable discussions.
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This work was supported by National Natural Science Foundation of China [32172948, 31800436], the “JBGS” Project of Seed Industry Revitalization in Jiangsu Province [JBGS(2021)034], the National Key R & D Programme of China [2018YFD0900301], and the Natural Science Foundation (NSF) of Jiangsu Province of China [BK20210563, BK20180728].
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WT and YS co-conceived this study, and supervised the experiments; MS, LS, ZK and ZX performed the experiments; WX, LY, SY, BY and CJ conducted the data analysis and created figures and tables; MS, LS and ZX wrote the manuscript; WT, MS and LY has contributed to the revision and refinement of this article.
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All experiments were performed in accordance with the Guidelines for the Care and Use of Laboratory Animals in China. The method of euthanasia followed the Chinese Laws for Animal Experimentation. This study was approved by the Ethics Committee of Experimental Animals at Nanjing Normal University (Grant No. SYXK 2015–0028, Jiangsu, China).
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Ma, S., Luo, S., Zhang, K. et al. Mitigation of low temperature stress by increased salinity is associated with multiple physiological responses in the gills of Takifugu fasciatus. Mar Biol 169, 141 (2022). https://doi.org/10.1007/s00227-022-04128-6
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DOI: https://doi.org/10.1007/s00227-022-04128-6