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An acute increase in water temperature can decrease the swimming performance and energy utilization efficiency in rainbow trout (Oncorhynchus mykiss)

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Abstract

In order to evaluate the effects of acute temperature exposure on the swimming performance of rainbow trout (Oncorhynchus mykiss), the critical swimming speed (Ucrit) and oxygen consumption rates (MO2) were determined at different temperatures (13.2, 18.4, and 22.5 °C). The Ucrit and MO2 of different body mass (109.44, 175.74, and 249.42 g) fish were also obtained at 13.4 °C. The Ucrit first increased as the temperature increased from 13.2 to 15.2 °C, which was calculated to be the optimal temperature for the Ucrit, and then decreased with increasing temperature. The optimal swimming speed (Uopt) showed a similar trend to the Ucrit. At a given swimming speed, the MO2 and cost of transport (COT) were significantly higher at 22.5 than at 13.2 °C, suggesting the energy utilization efficiency decreased with increasing temperature. The absolute values of Ucrit and Uopt increased as the body mass increased from 109.44 to 249.42 g, whereas the relative values decreased. Although not statistically significant, the maximum metabolic rate (MMR) tended to increase with temperature but decrease with body mass. Results can be of value in understanding the behavioral and physiological response of rainbow trout to acute temperature change.

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Acknowledgments

The authors would like to thank the anonymous reviewers for their helpful comments.

Authors’ contributions (all authors should be included)

X.M.Y. conceived and designed the experiments. L.M.Y. and H.Q.L. carried out the experiments. L.C. and M.L.W. analyzed the data and created the tables and figures. L.M.Y. and X.M.Y. wrote the article.

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This work was supported by funds from Support High-Level Talent Innovation and Entrepreneurship Project of Dalian (2016RQ067), Educational Department of Liaoning Province (DL201703), and Key Laboratory of Mariculture & Stock Enhancement in North China’s Sea, Ministry of Agriculture and Rural Affairs, Dalian Ocean University, P. R. China (2018KF20).

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Correspondence to Xiaoming Yu.

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All animal procedures used complied with the Guidelines for the Care and Use of Laboratory Animals in China and were approved by the Ethics Committee of Dalian Ocean University.

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Yin, L., Chen, L., Wang, M. et al. An acute increase in water temperature can decrease the swimming performance and energy utilization efficiency in rainbow trout (Oncorhynchus mykiss). Fish Physiol Biochem 47, 109–120 (2021). https://doi.org/10.1007/s10695-020-00897-3

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  • DOI: https://doi.org/10.1007/s10695-020-00897-3

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