ISSN : 1225-3480
인공종묘로 생산된 동죽, Mactra veneriformis의 크기, 수온, 염분 변화에 대한 여수율과 먹이섭이량의 차이를 조사하였다. 수온의 경우 소형, 대형그룹의 여수율은 5℃에서 최소값을보였으며 20℃에서 가장 높은 값을 보였으나, 25℃에서 급격한 감소 경향을 보였다. 염분에 대한 소형그룹의 여수율은 26 ‰에서 가장 높은 값을 보였고 8 ‰에서 가장 낮은 값을 보였다. 대형그룹은 32 ‰에서 가장 높은 값을 보였고, 8 ‰에서가장 낮은 값을 보였다. 본 연구를 통해 동죽의 최적 수온,염분환경은 20℃, 27-32 ‰이며, 10℃ 이하 또는 25℃ 이상의 수온과 20 ‰ 이하의 저염분에서 여수율이 낮아진다는 사실을확인할 수 있었다.
Clearance rate and feeding of surf clam, Mactra veneriformis were determined for 5 different water temperature regime (5, 10, 15, 20, 25℃) and salinity regime (8, 14, 20, 26, 32 ‰) with small group (86.62 ± 7.10 mm in shell length) and large group (147.99 ± 10.83 mm in shell length). Clearance rate and feeding increased with water temperature up to 20℃, but rapidly decreased at 25℃. The minimal clearance rate and feedign was recorded at 5℃. surf clam showed low clearance rate and feeding at low salinity (below 20 ‰) and maximum values at high salinity (26-32 ‰).
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