National Aquatic Resources Research & Development Agency (NARA)

Size at Maturity and Apawning Periodicity of the Mud Crab scylla serrata (Forskal) in the Negombo Estuary

By: Series: Journal of National Science Council. Vol.21.No.1 Publication details: 1993Description: 141-152p
Contents:
Some aspects of reproductive biology of the mud crab; Scylla scrrntn in the Negombo estuary were studied by screening bi-weekly samples over a period of one year. The study revealed that the size of the female crab at first maturity was 12 cm and the estimated pre-spawning and post-spawning fecundities were around 3 and 1.5 million respectively. The ova mature at the size of about 300 /<m and are found in three batches indicating a partial spawning behaviour. Spawning occurs in two seasons, April and August. The sex ratio was uneven in most size groups and in most months of the year. About 85% of the commercial catches comprise immature females.
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Some aspects of reproductive biology of the mud crab; Scylla scrrntn in the Negombo estuary were studied by screening bi-weekly samples over a period of one year. The study revealed that the size of the female crab at first maturity was 12 cm and the estimated pre-spawning and post-spawning fecundities were around 3 and 1.5 million respectively. The ova mature at the size of about 300 /<m and are found in three batches indicating a partial spawning behaviour. Spawning occurs in two seasons, April and August. The sex ratio was uneven in most size groups and in most months of the year. About 85% of the commercial catches comprise immature females.

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