Growth and thermal tolerance of a Tibet fish Schizopygopsis younghusbandi juveniles acclimated to three temperature levels

文献类型： 外文期刊

第一作者： Zhu, Tingbing

作者： Zhu, Tingbing;Li, Xuemei;Wu, Xingbing;Yang, Deguo

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关键词： acclimation; growth; Schizopygopsis younghusbandi; thermal tolerance

期刊名称：JOURNAL OF APPLIED ICHTHYOLOGY （ 影响因子：0.892； 五年影响因子：0.956 ）

ISSN： 0175-8659

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收录情况： SCI

摘要： Schizopygopsis younghusbandi is an endemic fish of Tibet characterized by slow growth. Artificial stock enhancement was applied to rebuild the natural population of S. younghusbandi in recent years. However, the optimal growth temperature and thermal tolerance of S. younghusbandi has not been studied, which restricts the production of S. younghusbandi fingerling for stock enhancement. The purpose of this paper is to determine the growth, critical thermal maximum (CTMax), lethal thermal maximum (LTMax) and acclimation response ratio (ARR) of S. younghusbandi juveniles (body weight 5.7 +/- 1.2 g) at three acclimation temperature levels (10, 15, 20 degrees C). The results showed that acclimation temperature significantly affected the growth, CTMax, LTMax and ARR of the experimental fish. Largest final weight (7.5 +/- 2.3 g) was recorded in 15 degrees C group. At a heating rate of 1 degrees C/30 min, CTMax ranged from 30.98 to 32.01 degrees C and LTMax ranged from 31.76 to 32.31 degrees C in the three acclimation temperatures. Schizopygopsis younghusbandi had lower ARR value (0.097) than most other fish species. Low ARR value indicates that S. younghusbandi may have narrower thermal tolerance range and weaker acclimation ability to global warming. For successful aquaculture of S. younghusbandi juveniles, temperature should be maintained around 15 degrees C.

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