Abstract
The Pacific oyster Crassostrea gigas is a sessile bivalve that inhabits the intertidal zone and therefore frequently exposed to air during the tidal cycle. It is highly adaptive to hypoxic conditions. We have studied the physiological state of oysters during long-term exposure to air. The oysters became hypoxic when exposed to air or hypoxic seawater. The 50% lethal time of oysters exposed to air at 4, 15 and 20°C was 47.8, 15.9 and 12.2 days, respectively. The hemolymph pH decreased by day 3; however, it showed a slight increase by day 5 at both 4 and 20°C. The adenylate energy charge (AEC) values decreased rapidly on the first day of air exposure in the adductor muscle, mantle, gill and body trunk, and these decreases were accompanied by decreases in ATP concentrations and increases in AMP concentrations. The AEC values in all of the tissues had fallen to below 30% by day 50 of air exposure at 4°C. These data suggest that the energy state of oysters deteriorates rapidly with air exposure. Consequently, AEC values may be useful indices of the physiological state of the oyster during long-term exposure to air.
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This work was partially supported by a grant from Fukui Prefectural University for Special Research Projects and also by a Sasakawa Scientific Research Grant from The Japan Science Society.
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Kawabe, S., Takada, M., Shibuya, R. et al. Biochemical changes in oyster tissues and hemolymph during long-term air exposure. Fish Sci 76, 841–855 (2010). https://doi.org/10.1007/s12562-010-0263-1
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DOI: https://doi.org/10.1007/s12562-010-0263-1