Population Dynamics of Penaeus indicus on the West Coast of Sri Lanka
Growth and mortality parameters of Penaeus indicus at Negombo and Chilaw (Sri Lanka) caught between September 1982 and June 1986 are analyzed on an annual basis using length-frequency data.
The asymptotic lengths for different periods and areas varied from 20.5 to 24.0 (total length) and the von Bertalanffy growth constant was between 1.5 and 1.8 per year. Total mortality varied from 2.89 to 4.49 per year. The mean natural mortalities for the whole period of study were 2.7 and 2.6 per year for Negombo and Chilaw, respectively. Fishing mortality was 0.39 to 0.97 per year in Negombo and 0.39 to 1.86•per year in Chilaw.
From the relative yield isopeths drawn, an increase of fishing effort to a value of fishing mortality of 2.6 per year can be made with an increase of minimum mesh size. As this is a multispecies fishery, the optimum mesh size should be determined after finding a balance with the other commercially important shrimp species.
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