Abstract
ABSTRACT Mass production method on artificial seedling production of hard clam Meretrix petechialis was developed indoor culture system. Spawning of adult clam (SL 65.8 ± 8.4 mm) was induced using the combined method of air exposure and water temperature raising. The fertilized eggs were developed to D-shaped larvae after 17.7 hours at 27℃ and hatching rate was 6.1%. Shell length (SL) of D-shaped larvae was measured to be 131.4 ± 2.6 μm and thereafter the larvae grew to the settled spats with SL 190.2 ± 7.5 μm in 4 days. Estimated survival rate of settled spats was 48.1%. Spat collection on 130,000 spats with SL 0.19 ± 0.01 mm performed conducted by sand bottom circulation filtering method. Collected spats grew up to 3.1 ± 0.8 mm in 46 days, 6.6 ± 1.8 mm in 87 days, and 10.5 ± 0.9 mm in 114 days. The relative growth between SL and shell height (SH) was calculated to be SH = 0.8501SL + 0.0196 (R 2 = 0.9987) during the whole spat period. During spats rearing, they were suffered from one time of mass mortality at SL 3.1 mm, but 51,000 spats were finally survived with the rate of 39.2% at 114 days of spat rearing in indoor tank system.
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