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open access
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ISSN : 1225-3480
Changes in seawater temperature that occur during the changing of the seasons are a serious challenge faced by scallop aquaculture farms. In this study, we investigated the physiological stress responses of bay scallop Argopecten irradians, to increases and decreases in water temperature. We measured the changes in the levels of expression of copper- and zinc-containing superoxide dismutase (Cu/ZnSOD), and heat shock protein (HSP) 90, as well as the concentrations of lipid peroxide (LPO) in tissues of bay scallops exposed to thermal stress conditions (low-temperature condition: 17°C → 11°C; high-temperature condition: 17°C → 25°C). The expression levels of Cu/ZnSOD and HSP90 mRNA were temperature-dependent following thermal changes. LPO concentrations increased significantly in response to temperature changes. Additionally, greater Cu/ZnSOD and HSP90 expression levels and LPO concentrations were observed under the high-temperature condition than under the low-temperature condition. The results indicate that low and high water temperature conditions induced oxidative stress in bay scallops, and that this effect was greater at high water temperatures than at low water temperatures. This study provides basic knowledge about thermal stress in bay scallops, and our results may contribute to the management of scallop aquaculture farms.
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