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      An Effective Method of Prompting Juvenile Rainbow Trout ( Oncorhynchus mykiss) to Cope with Heat Stress

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          In the present study, juvenile rainbow trout ( Oncorhynchus mykiss) were acclimated at 5 temperatures. Fish in the control group (C 0) were reared at a constant temperature (16°C); trout in four other treatments (A 0, A 3, A 6, and A 9) were acclimated to a high temperature (22°C) for 0, 3, 6, and 9 d, respectively, and then returned to normal temperature (16°C) for 7 d. The temperature was then raised to 20°C and the fish were cultured for 40 d. The results showed that the growth rates of A 3, A 6, and A 9 were higher than that of A 0 but lower than that of C 0. The growth rate of A 9 was the highest among the 4 acclimation groups. The activities of serum transaminase and liver antioxidant enzyme significantly increased during acclimation. At the beginning of growth, the activities of enzymes were lower in A 3, A 6, and A 9 with the lowest in A 9. In addition, the transcript abundance of heat shock protein (HSP) 60 gene in A 9 was not significantly different from that of C 0 during growth. HSP70 in A 9 significantly increased at the beginning and returned to that of C 0 at the end. Our findings indicated that pre-acclimation improved the high temperature tolerance with the best effectiveness observed at 22°C for 9 d. A possible mechanism underlining such phenomenon is the improvement of antioxidant defense system.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          20 December 2019
          01 February 2020
          : 19
          : 1
          : 216-224
          1Key Laboratory of Mariculture of Ministry of Education, Ocean University of China, Qingdao 266100, China
          2Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266235, China
          Author notes
          *Corresponding author: DONG Shuanglin, Tel: 0086-532-82031691, E-mail: dongsl@
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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