Population Dynamics of Indian Shrimp (penaeus indicus, milne edwards) on the West Coast of Sri Lanka
Jayakody, D.S.
Population Dynamics of Indian Shrimp (penaeus indicus, milne edwards) on the West Coast of Sri Lanka - Phillippines, Asian Fisheries Science, 1988, - 123-146p.
Monthly length-frequency data of Penaeus indicus collected at Negombo and Chilaw during 1979-1981 were analyzed to trace von Bertalanffy growth curves. The asymptotic length and the growth constant were estimated to be 5.65 cm (carapace length) and 1.8 year"*, respectively. Based on these growth parameters, the total mortality rate during the study period was determined to be 4.41 year*!. Natural mortality rate was calculated as 3.04 and hence fishing mortality rate (F) was 1.37. Recruitment was continuous with two peaks per year. From the study, the maximum lifespan of P. indicus is about two years. The yield-per-recruit analysis shows that high yield-per-recruit values are obtained at high fishing mortalities which may not be biologically and/or commercially appropriate.
Population Dynamics of Indian Shrimp (penaeus indicus, milne edwards) on the West Coast of Sri Lanka - Phillippines, Asian Fisheries Science, 1988, - 123-146p.
Monthly length-frequency data of Penaeus indicus collected at Negombo and Chilaw during 1979-1981 were analyzed to trace von Bertalanffy growth curves. The asymptotic length and the growth constant were estimated to be 5.65 cm (carapace length) and 1.8 year"*, respectively. Based on these growth parameters, the total mortality rate during the study period was determined to be 4.41 year*!. Natural mortality rate was calculated as 3.04 and hence fishing mortality rate (F) was 1.37. Recruitment was continuous with two peaks per year. From the study, the maximum lifespan of P. indicus is about two years. The yield-per-recruit analysis shows that high yield-per-recruit values are obtained at high fishing mortalities which may not be biologically and/or commercially appropriate.