전자저널 > 전자저널 > Tolerance against Water Temperature and Growth of Ruditapes philippinarum Spats in Different Substrates

Tolerance against Water Temperature and Growth of Ruditapes philippinarum Spats in Different Substrates

Kwang-Sik Min, Seung-Ju Lee, Byoung-Hak Kim and Ki-Yeol Park

Shellfish Research Center, National Fisheries Research and Development Institute, Gyeongsangnam-do, 668-821, Korea

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 ± 0.4 mm. In the FRP tank bottom and sand bottom, the average shell lengths of spats were 3.6 ± 0.3 mm and 3.2 ± 0.3 mm, 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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