전자저널 > 전자저널 > Effect of Temperature and Body Size on Oxygen Consumption andAmmonia Excretion of Oyster, Crassostrea gigas

Effect of Temperature and Body Size on Oxygen Consumption and
Ammonia Excretion of Oyster, Crassostrea gigas

Yun Kyung Shin, Young-Baek Hur, Jeong-In Myeong and Sik Lee

South sea Mariculture Research Center, NFRDI, Namhae, 668-821, Korea

The tendency of metabolism in oyster, Crassostrea gigas, was investigated in relation to the water temperatureand salinity. Oxygen consumption and ammonia excretion were measured and O:N ratio were calculatedaccording to the water temperature from February 2007 to September 2008 and body size. The relationshipbetween oxygen consumption and body weight has been examined in C. gigas. The weight-specific oxygenconsumption rate (mg O2/g/h) varied inversely with size. Oxygen consumption and ammonia excretion increasedwith an increase in water temperature. O:N ratio measured in this study ranged from 8 to 40 under ordinary seawater and the ratio was 8 at 25℃ and 16 at 10℃. This indicates that oyster mainly use the protein as the primarycatabolic substrate during gametogenesis. Lower O:N ratio in winter suggests that oysters have to meet theirenergy demand by metabolizing protein to survive in stressful conditions such as low temperature and lack ofsufficient food supply. This studies will provide the basic data for oyster culture farm in assessing the carryingcapacity and sustainable management.

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