Population dynamics of Nemipterus japonicus (Bloch) in the trawling grounds off Cochin


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Authors

  • K. K. Joshi

Abstract

Population dynamics of Nemipterus japonicus (Bloch), the dominant species of threadfin breams fished off Cochin was studied during the period 2000-2002. N. japonicus was dominant during south-west monsoon and its spawning season extended from May to November. The estimated VBGF parameters were Lα= 318 mm, K= 0.69 yr-1(males), and Lα = 265 mm, K= 0.77 yr-1(females) indicating marked growth difference between the two sexes of N. japonicus. The study indicated that the present fishing effort along Cochin has reached an optimum level. The maximum yield in the present level of F can be obtained by increasing the length at first capture by 177 % of the present yield. The reduction in the cod-end mesh size unless stopped will lead to recruitment overfishing over a period of years.

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Issue

Vol. 57 No. 1 (2010)

Section

Articles

License

The copyright of the articles published in Indian Journal of Fisheries vests with the Indian Council of Agricultural Research, who has the right to enter into any agreement with any organization in India or abroad engaged in reprography, photocopying, storage and dissemination of information contained in these journals. The Council has no objection in using the material, provided the information is being utilized for academic purpose but not for commercial use. Due credit line should be given to the ICAR where information will be utilized.

How to Cite

Joshi, K. K. (2011). Population dynamics of Nemipterus japonicus (Bloch) in the trawling grounds off Cochin. Indian Journal of Fisheries, 57(1), 7-12. https://epubs.icar.org.in/index.php/IJF/article/view/7514