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Population biology and genetic diversity of two adjacent shrimp (Parapenaeopsis coromandelica) populations exploited under different fishing pressures in the coastal waters of Sri Lanka

Published online by Cambridge University Press:  13 July 2011

M.D.S.T de Croos*
Affiliation:
Institute of Biology, University of Iceland, Sturlugata 7, 101 Reykjavik, Iceland
Snæbjörn Pálsson
Affiliation:
Institute of Biology, University of Iceland, Sturlugata 7, 101 Reykjavik, Iceland
*
Correspondence should be addressed to: M.D.S.T de Croos, Institute of Biology, University of Iceland, Sturlugata 7, 101 Reykjavik, Iceland email: dileepa_dc@yahoo.com

Abstract

Parapenaeopsis coromandelica shrimp populations along the western coast of Sri Lanka have supported coastal trawling for the last hundreds of years. Two non-overlapping adjacent fishing grounds (Hendala and Negombo) sustain different fishing intensities. In order to obtain information on the population structure and genetic diversity of P. coromandelica in these two regions, differences in length–weight relationships, growth, spawning seasons, sex-ratios, gonadosomatic index, length at 50% maturity (L50) and sequence variation of the mitochondrial cytochrome oxidase subunit I were examined. Significant differences in population biology and genetic diversity were revealed from the two fishing grounds. Samples of Hendala showed lower L50 and genetic diversity which are considered as potential effects and symptoms of extensive selective harvesting. Further, the shrimps' behaviour seems to be triggering the separation through low mixing of individuals at the two fishing grounds resulting in significant divergence based on haplotype frequencies. Management of P. coromandelica should consider the revealed biological and genetic evidences on existence of two sub-populations/stocks together with a routine monitoring of genetic effects due to harvesting.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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References

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Supplementary material: File

De Croos Supplementary Table

Table S1: Weight of Parapenaeopsis coromandelica analysed with ANCOVA analysis using the generalised least square method, comparing fishing grounds, separately for females and males and for each months, with carapace length (CL) as a covariate. Weight and carapace length were both log-transformed.

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