ISSN : 1225-3480
바지락 치패의 수온내성 실험 결과, 생존율은 15℃, 20℃, 25℃ 및 30℃의 수온에서 각각 99.7%, 91.0%, 88.7% 및 73.3%로 나타났으며, 수온 35℃에서는 전량 폐사하였다 (p < 0.05). 수온상승 및 하강 (5℃, 10℃, 15℃) 자극 실험 결과, 수온하강에 대한 치패의 내성은 강했으나, 수온상승의 경우 온도차가 클수록 폐사율이 높아지는 경향을 나타내었다. 서로 다른 바닥기질에서 평균 각장 240.4 ± 9.30μm의 착저기 유생을 사육한 결과, 성장은 염화비닐파판 기질에서 3.9 ± 0.4mm로 가장 빨랐으며, 수조저면과 모래기질에서 각각 3.6 ± 0.3mm와 3.2 ± 0.3mm로 나타내었다. 생존율은 모래기질에서 38.2%로 가장 높았으며, 수조저면과 염화비닐파판 기질에서 36.7%와 23.3%로 각각 나타내었다. 수조당 생산성 (총중량) 은 수조저면에서 26.0 g으로 가장 높았으며, 모래 및 염화비닐파판기질에서 22.9 g, 20.6 g으로 나타내어 바닥기질 구간에 유의한 차이가 있었다 (p < 0.05). 생산된 바지락 치패의 크기 분포를 조사하기 위해 표준망체로 선별한 결과, 염화비닐파판기질에서 가장 큰 개체군인 각장 3.9 mm 이상의 치패 분포 비율이 56.8%로 가장 높았다.
Water temperature tolerance of spats of the Manila clam, Ruditapes philippinarum was investigated in the different temperature groups, 15, 20, 25, 30 and 35℃. The survival rates of the groups were 99.7%, 91.0%, 88.7%, 73.3% and 0%, respectively (p < 0.05). When the temperature of the water decreased from 15℃ to 5℃, the survival of spats was higher than when the temperature increased.The growth and survival of spats were investigated in different types of bottom substrates in the tanks. The spats grew the best in the polyvinyl plates, the average shell length was 3.9 ± 0.4mm. In the FRP tank bottom and sand bottom, the average shell lengths of spats were 3.6 ± 0.3mm and 3.2 ± 0.3mm, respectively. The best survival of spats was 38.2% in the sand bottom. In the FRP tank bottom and polyvinyl plates, survival were recorded 36.7% and 23.3% respectively. Total weight of spats cultured in the FRP tank bottom was (26.0 g) greater than that in the sand bottom (22.9 g) and in the polyvinyl plates (20.6 g) (p < 0.05).
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