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PRELIMINARY STUDY ON ARTIFICIAL BREEDING OF Mactra quadrangularis |
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Sexually matured parent clams were put in the dark to drain away the water, then rinsed in running water for some time before being transfered into seawater with amonia for breeding. Breeding rate is about 60.8-80.0%. The development of embryo is faster with rising temperature, but larva grows faster in 17.5-22.7℃. Embryo grow faster at specific gravity 1.020-1.025, but larva in specific gravity 1.010-1.025. Young larvae were fed with "7902" (an unidentified algae) sands were being added before metamorphosis as substratum. Water is changed every day and aerated regularly. It takes 45 days for the fertilized egg to develop into a seeding of 0.2-0.3cm long. |
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