전자저널 > 전자저널 > Influence of Temperature, Salinity and Hypoxia on Survival andMetabolic Rate in the Ark Shell, Scapharca broughtonii

Influence of Temperature, Salinity and Hypoxia on Survival and
Metabolic Rate in the Ark Shell, Scapharca broughtonii

Yun Kyung Shin, Byoung Hak Kim, Nack Joong Choi, Choon Goo Jung and Min Woo Park

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

The ark shell, Scapharca broughtonii were collected from the Jinhae bay in Kyungnam, Korea from April 2006 to October 2007. To assess how much they have tolerance against hypoxia under the compound condition of temperature and salinity, survivorship, oxygen consumption rate and external features of Scapharca broughtonii were measured. The 7 days-LC50 of dissolved oxygen (DO) for Scapharca broughtonii at 15℃-ordinary sea water and 26±1 psu was 1.98 mg/L (confidence limit: 1.45-2.39 mg/L) and 2.63 mg/L (confidence limit: 1.76-3.37 mg/L) respectively. Whereas 3 days-LC50 at 25℃-ordinary sea water was 3.89 mg/L (confidence limit: 3.36-4.55 mg/L) and 4 days-LC50 at 25℃-26±1 psu was 3.74 mg/L (confidence limit: 3.19-4.43 mg/L). Oxygen consumption rate with each experimental group was decreased during the period exposed to hypoxia. To recovery, they were replaced to ordinary and oxygen consumption rate was increased a little, but all died. The color of the umbo of shell in Scapharca broughtonii was changed dark during hypoxia. These data will provide important fundamental information for examining the causes of mass mortality of shellfish in the summer.

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