전자저널 > 전자저널 > Effects of Rearing Condition and Species of Microalgae on Growthand Survival of Larvae of the Sunray Surf Clam, Mactra chinensis

Effects of Rearing Condition and Species of Microalgae on Growth
and Survival of Larvae of the Sunray Surf Clam, Mactra chinensis

Byeong-Hee Min and Hyo Jin Shin

Busan Marine Fisheries Resources Research Institute, Busan 618-814, Korea

Rearing condition and species of microalgae on growth and survival of the sunray surf clam, Mactra chinensis larvae were investigated for artificial seedling production. The larvae of M. chinensis on higher temperature showed high growth and low survival and was grown over 230 μm in shell length 14 days after hatching, but low growth as 151.1 μm at 18℃. The larvae of M. chinensis on salinity showed highest daily growth and survival as 11.3 μm and 65.8% at 30 psu, respectively. The optimum of water temperature and salinity for the larval rearing were 23℃ and 30-35 psu over 25 psu at least. The density of larval rearing was below 10 per 1 ml in rearing seawater for elevating the development rate from D-shaped to settled (metamorphosing) stage. The larvae fed the mixed diet of Isochrysis galbana, Pavlova lutheri, Isochrysis sp. (green), Chlorella ellipsoidea showed highest growth and survival. The larvae fed the single diet of I. galbana, Isochrysis sp. (green) showed high growth and survival. But the larvae fed the single diet of P. lutheri and C. ellipsoidea showed low growth and survival. The optimum diet of larvae of M. chinensis was over two species of microalgae included I. galbana, Isochrysis sp. (green) for elevating the high growth and survival.

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