Spawning, larval development and spat settlement of the clam, Meretrix casta (Chemnitz) in the laboratory

Sreenivasan, P V and Rao, K Satyanarayana (1991) Spawning, larval development and spat settlement of the clam, Meretrix casta (Chemnitz) in the laboratory. Indian Journal of Fisheries, 38 (1). pp. 1-8.

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Abstract

The dam, Meretrix casta (Chemnitz) WM induced to ipawn in the laboratory on 2 occasioni by mcreating wat«' temperature by 3'-7'C from ambient lemfieraturB. Spawning was intense on both the occasions. The fertilized ovum measured 0.08S mm. After passing through early suges of deveiofsnent, the trochophore stage was attained by 6 hr after spawning. D-shaped free-swimming veli^er larva was fomned by 14 hr. The leva started feeding on the microalga, Isoehrysis gaUfana, from the second day after qtawning. The larvae sMtled as spat on dghtfi or nkth day measuring 0.216 mm x 0.201 mm 0ength x height). It attained a size of 2.5 mm x 2.3S mm by SOth day. Pigmentation ctf the periostracum varied leading to muiy mortis, of wbidi S major types could be recognized. Spat numbering about 50000 were produced in each experimmt.

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