Effects of rearing temperature on growth,metabolism and thermal tolerance of juvenile sea cucumber,Apostichopus japonicus Selenka: critical thermal maximum (CTmax) and hsps gene expression |
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| Authors: | Qing‐Lin Wang Yun‐Wei Dong Chuan‐Xin Qin Shan‐Shan Yu Shuang‐Lin Dong Fang Wang |
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| Institution: | 1. The Key Laboratory of Mariculture, Ministry of Education, Fisheries College, Ocean University of China, , Qingdao, China;2. State Key Laboratory of Marine Environmental Science, College of Oceanography and Environmental Science, Xiamen University, , Xiamen, China;3. South China Sea Fisheries Research Institute, Chinese Academy of Fishery Science, , Guangzhou, China |
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| Abstract: | Effects of different rearing temperatures (16, 21 and 26°C) on growth, metabolic performance and thermal tolerance of juvenile sea cucumber Apostichopus japonicus (initial body weight 7.72 ± 0.96 g, mean ±SD) were investigated in this study. During the 40‐day experiment, growth, metabolic performance, food intake and energy budget at different reared temperatures were determined. Sea cucumbers rearing at 16°C obtained better growth (final body weight 11.96 ± 0.35 g) than those reared at 21 (10.33 ± 0.41 g) and 26°C (8.31 ± 0.19 g) (P < 0.05), and more energy was allocated for growth at 16°C (162.73 ±11.85 J g?1 d?1) than those at 21(79.61 ± 6.76 J g?1 d?1) and 26°C (27.07 ± 4.30 J g?1 d?1) (P < 0.05). Critical thermal maxima (CTmax) values of juvenile sea cucumbers reared at 16, 21 and 26°C were 33.1, 34.1 and 36.6°C, respectively, and the upregulation of hsps in sea cucumbers reared at 26°C was higher than those acclimated at lower temperatures (16 and 21°C), indicating that temperature acclimation could change the thermal tolerance of the sea cucumber, and CTmax and hsps were sensitive indicators of the sea cucumber's thermal tolerance. |
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| Keywords: | rearing temperature sea cucumber growth metabolic performance thermal tolerance critical thermal maxima |
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