Abstract
The study investigated the effects of seawater acclimation at constant and diel temperatures on the growth, osmoregulation, and branchial phospholipid fatty acid (PLFA) composition in rainbow trout (Oncorhynchus mykiss). The fish (initial weight, 62.28 ± 0.41 g) were reared at a constant 13.0 °C (CT) or with a diel cycle of either 13.0 ± 1.0 °C (VT2) or 13.0 ± 2.0 °C (VT4) for 6 weeks, and subsequently subjected to seawater acclimation. Diel temperature variations (of up to 4 °C) did not affect the growth rate of rainbow trout maintained in freshwater, but alleviated the impairment on the growth after seawater challenge. Under all temperature conditions, rainbow trout were well prepared to seawater acclimation. The diel cyclic temperature resulted in fish with reduced fluctuations in plasma electrolyte levels, branchial Na+–K+ ATPase activity, and plasma osmolality. In freshwater, the sum of the monounsaturated fatty acids was significantly higher in the VT4 relative to CT and VT2 treatment. Conversely, the sum of polyunsaturated fatty acids was significantly lower in the VT4 fish. After seawater transfer, the branchial PLFA profiles of the fish significantly changed, but those in CT and VT2 did not recover afterwards (the degree of unsaturation was downregulated). The PLFA composition of fish in the VT4 treatment appeared to be steadier under seawater acclimation. This study suggests that a diel cyclic temperature (13.0 ± 2.0 °C) can alleviate the impairment of growth, enhance osmoregulation capability, and improve the stability of the branchial PLFA composition in rainbow trout after seawater acclimation.
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Acknowledgements
The authors would like to express our gratitude to those who have critically reviewed this manuscript and helped collect samples. This study was funded by the National Key Research and Development Program of China (Project No. 2019YFD0901000), the National Natural Science Foundation of China (No. 31702364), and the Primary Research and Development Program of Shandong Province (Nos. 2018CXGC0101 and SD2019YY006).
Funding
This study was funded by the National Key Research and Development Program of China (Project No. 2019YFD0901000), the National Natural Science Foundation of China (NSFC) (No. 31702364), and the Primary Research and Development Program of Shandong Province (Nos. 2018CXGC0101 and SD2019YY006).
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JG carried out the entire experiment, analysed the data and drafted the manuscript with the guidance of YZ and SD. MH, QD and RL helped analyse samples. QG, and YD helped edit this manuscript. YZ was responsible for the integrity of the work as a whole.
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Ge, J., Huang, M., Zhou, Y. et al. Effects of seawater acclimation at constant and diel cyclic temperatures on growth, osmoregulation and branchial phospholipid fatty acid composition in rainbow trout Oncorhynchus mykiss. J Comp Physiol B 191, 313–325 (2021). https://doi.org/10.1007/s00360-020-01330-0
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DOI: https://doi.org/10.1007/s00360-020-01330-0