전자저널 > 전자저널 > Growth and survival of the brackish water clam, Corbicula japonica larvae according to rearing conditions

Growth and survival of the brackish water clam, Corbicula japonica larvae according to rearing conditions

Jeong-Yong Lee, Wan-ki Kim and Chae-sung Lee

National Fisheries Research and Development Institute Korea Fisheries Resources Agency

In order to know the effects of rearing conditions such as water temperature, salinity, larval stocking density, kinds and amounts of food organism and seedling collection method on seedling production of the brackish water clam, Corbicula japonica, the growth and survival rate of the larvae were investigated at each rearing condition. The shell length of larvae showed faster growth at 24℃ and 27℃, and survival rate showed good results at 18℃ and 21℃. Based on growth and survival rate according to water temperature, the optimal water temperature for larvae rearing was 24℃. At the salinity of more than 3 psu, the growth and survival rate were higher than 0 psu. The optimal salinities for larvae were 6-9 psu. Growth and survival rate of larvae were high at low stocking density and the optimum stocking density of larvae was 10 inds./ml. Daily feeding concentrations of 10,000-20,000 cell/ml of food organisms mixed Pavolva lutheri, Isochrysis galbana and Chaetoceros calcitrans were very effective. Full grown larvae collection from various substratum was significantly higt in sand, especially sand size was less than 0.25 mm.

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