Effects of heat-shock selection during pelagic stages on thermal sensitivity of juvenile sea cucumber, <Emphasis Type="Italic">Apostichopus japonicus</Emphasis> Selenka |
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| Authors: | Qing-Lin Wang Yun-Wei Dong 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, 266003, People’s Republic of China;(2) The State Key Laboratory of Marine Environmental Science, College of Oceanography and Environmental Science, Xiamen University, Xiamen, 361005, People’s Republic of China; |
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| Abstract: | The effects of heat-shock during pelagic stages on growth and survival of juvenile sea cucumber Apostichopus japonicus were investigated to test the possibility to acquire high thermal tolerance individuals after the heat-shock selection. Larvae
at the stages of blastula, gastrula, and auricularia were heat-shocked at selected temperatures (21.5, control; 26, 28, and
30°C) for 45 min and returned to 21.5°C for continuous rearing. There was a significant difference in thermal sensitivity
among different developmental stages, and thermal tolerance of the larvae was correlated with the expression of heat shock
protein 70 (Hsp70). Juveniles after the heat-shock selection at pelagic stages showed higher induced thermotolerance than
those without heat-shock. Therefore, heat-shock application at early pelagic development stages is potentially a useful way
to select high-thermotolerance variety of the sea cucumbers. |
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