International Journal of Fisheries and Aquatic Research

International Journal of Fisheries and Aquatic Research


International Journal of Fisheries and Aquatic Research
International Journal of Fisheries and Aquatic Research
Vol. 2, Issue 2 (2017)

Length-based population parameters of Indian Snapper, Lutjanus madras (Valenciennes 1831) off Madras coast along southeast coast of India


Pradeep HD

This study estimates some of the population parameters of Indian snapper, Lutjanus madras off Madras coast along southeast coast of India based on length-frequency data. A total of 776 specimens in the length range of 120-280 mm total length were collected from the trawl catches of the vessel M.F.V. Samudrika (OAL: 28.8m, GRT: 151T, BHP: 650) from January 2007 to June 2009 between the area Lat.12°30’ N to 13° 32’ N and Long. 80° 12’E to 80°30’E. The samples were also collected from Royapuram fish landing centre.The length frequencies collected were analysed with the help of electronic package FiSAT.

The parameters L∞ and K were 294.0 mm, 0.52/year. The von Bertalanffy growth equation for L. madras is L = 294[1-e-0.52(t- t0 ) ]. The recruitment pattern is unimodal and the period of recruitment was from January to July with peak during April and May. The longevity of the species was calculated as 6 years. After 1st, 2nd, 3rd, 4th 5th and 6th year the length attained by the species is 119.2, 190.1, 232.2, 257.3, 272.2 and 281.0 mm respectively. The mortality parameters were Z=0.89, M =0.61, F=0.28 and the exploitation ratio was 0.32. The virtual population analysis for L. madras indicated that the natural morality due to natural cause was upto 140 mm mid-length, however the fishing pressure was observed at 160 mm size and it increased thereafter.
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How to cite this article:
Pradeep HD. Length-based population parameters of Indian Snapper, Lutjanus madras (Valenciennes 1831) off Madras coast along southeast coast of India. International Journal of Fisheries and Aquatic Research, Volume 2, Issue 2, 2017, Pages 32-36
International Journal of Fisheries and Aquatic Research