전자저널 > 전자저널 > Artificial Mass Culture of Flat Oyster Larvae, Ostrea denselamellosa, and Collection Rates according to Various Spat Collection Methods

Artificial Mass Culture of Flat Oyster Larvae, Ostrea denselamellosa, and Collection Rates according to Various Spat Collection Methods

Moon Ho Yang, Hyung-Sub Kim, Jae-yong Lee and Chang Hee Han

Namhae Marine Hatchery, National Fisheries Research and Development Agency, Namhae 668-820, Korea

This research was conducted to develop seedling production techniques in flat oyster, Ostrea denselamellosa. The cultivation of larvae, artificial spat and spats collection in natural conditions rate were examined. In the mass culture tank (3 tons), average growth rates of the D Shape larvae of initial shell length (153.4 μm) and shell height (153.4 μm) were 202.6% and 212.9% at 16 days and 227.1%, 241.8% at 20 days, respectively. Instantaneous death and survival rate of the larvae were 0.160 and 54.8% at 16 days and 0.057 and 43.2% at 20 days, respectively. Collection rate of flat oyster from bottom using various collectors with oyster shell, scallop shell, ark shell and PVC plates were 32.9%, 24.1%, 16.8% and 10.0%, respectively. and the greatest collecting rate was 131.9 individuals/shell (32.9%) in laid collectors on the bottom. The collecting rate of the oyster larvae were better in laid collectors on the bottom 83.8 individuals/collection than in the suspended string 54.2 individuals/collection. in all collecting substrates. Early spats settled on collectors were grew to 2.38 ± 0.97 mm in shell length and 2.16 ± 0.86 mm in shell height at 26 days. The spats were grew to 28.58 ± 2.39 mm in shell length and 31.65 ± 2.03 mm in shell height during the 4 month mid-term cultivation. In the period of cultivation, the mean number of spats attached to collectors were 10.3 individuals at oyster shells, 5.8 scallop shells, 4.0 ark shells and 1.5 PVC plates, respectively.

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