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Abstract
A 26- day experiment has been conducted to find out the most suitable substrate for scaly giant clams Tridacna squamosa‘s larvae from pediveliger stage to spat stage. The experiment was replicated three times with four different substrate treatments (200 μm mesh, dead coral, sand and composite) in 1-m³ tanks, at salinity of 30‰. Larval density was 5 individuals/ml. Feeds were single-celled algae such as Isochrysis galbana, Chaetoceros sp and symbionts at the densities from 6,000 to 9,000 cells/ml. The results showed that in 4 types of the above substrates, the dead coral gave the highest growth in height, absolute growth rate in heith, settement rate and survival rate. The larvae’s average height after 26 days cultured was 1,020.8 μm, the growth rate in the height were 34.63 μm / day, the settlement rate was 55.2% and the survival rate was 42.8%.
Key words: substrate, settement stage, scaly giant clams, Tridacna squamosa