ISSN : 1225-3480
본 연구는 피조개의 용존산소에 대한 내성을 구명하기 위하여 경남 진해만에 서식하는 피조개를 대상으로 수온과 염분에 대한 용존산소 농도별 생존율, 산소소비율 및 외부 형태 변화 등을 조사하였다. 피조개의 용존산소에 대한 <TEX>$LC_{50}$</TEX>은 수온 <TEX>$15^{\circ}C$</TEX>-일반해수와 염분 <TEX>$26{\pm}1$</TEX> psu에서 7일 동안 각각 1.98mg/L (신뢰한계: 1.45-2.39 mg/L)와 2.63 mg/L (신뢰한계: 1.76-3.37mg/L)였다. 한편 <TEX>$25^{\circ}C$</TEX>-일반해수와 염분 <TEX>$26{\pm}1$</TEX> psu에서는 각각 3.89 mg/L (신뢰한계: 3.36-4.55 mg/L)과 3.74 mg/L (신뢰한계 3.19-4.43 mg/L)으로 고수온에서 용존산소에 대한 내성이 약한 것으로 나타났다. 산소소비율은 모든 실험구에서 저산소 노출기간동안 감소하였으며, 회복가능성을 파악하기 위하여 일반해수로 전환시킨 경우 산소소비율을 증가시키며 산소부채에 의한 회복반응을 보였으나 모두 폐사하였다. 저산소 노출기간동안 패각 각정부위의 색깔이 검게 변화하는 것이 관찰되었다. 이 자료는 피조개 집단 폐사원인 구명을 위한 기초자료로 활용할 수 있을 것으로 여겨진다.
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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