Early ontogeny of the Asian catfish Magur , Clarias batrachus ( Linnaeus , 1758 )

The Asian catfish, Clarias batrachus (Linnaeus, 1758), known as magur, is a popular food fish of Asian countries for its medicinal value. The major constrain behind culturing this species is scanty knowledge on larval rearing and fourth day mortality syndrome. For mass production of C. batrachus, identification of significant developmental events is essential. Here early and post-embryonic stages of C. batrachus were described through microphotographs. The first mitotic cleavage occurred at 62 minutes postfertilization resulting in 4, 8, 16, 32, 64 blastomeres, followed by development of morula, blastula and gastrula stages. The first larva (Total Length 4.5 ± 0.5 mm) emerged after 26 hours at 26 ± 0.5°C. At fourth day post hatching, the larvae (Total Length 9.2 ± 1 mm) commenced fully on exogenous feeding. This study specified the ontogenic changes and commencement of exogenous feeding in C. batrachus which would lead to successful larval rearing for mass production.

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