Length-weight relationships of three reef-associated fishes Lutjanus gibbus, Pinjalo lewisi and Pristipomoides filamentosus off Kochi, southwest coast of India

Wilson, Livi and Najmudeen, T M and Zacharia, P U and Sunil, K T S and Radhakrishnan, M (2019) Length-weight relationships of three reef-associated fishes Lutjanus gibbus, Pinjalo lewisi and Pristipomoides filamentosus off Kochi, southwest coast of India. Journal of the Marine Biological Association of India, 61 (2). pp. 84-88.

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Abstract

Length-weight relationships (LWRs) of three reef-associated fishes belonging to the family Lutjanidae viz ., Lutjanus gibbus (Forsskal, 1775), Pinjalo lewisi Randall, Allen & Anderson, 1987 and Pristipomoides filamentosus (Valenciennes, 1830), were estimated based on 548 samples collected from trawl net and hook and line fishery off Kochi, southwest coast of India. Sampling was done at Kochi (Lat. 09°56′327′′N, Long. 76°15′764′′E) and Munambam (Lat. 10°10′965′′N, Long. 76°10′258′′E) landing centers from May 2017 to November 2019. The estimated coefficient (b value) ranged from 2.597 ( P. lewisi , N = 89) to 2.902 (P. filamentosus , N = 240). Coefficient of determination (r2) ranged from 0.906 ( L. gibbus ) to 0.952 ( P. filamentosus), indicating a strong functional LWRs that were highly significant (p <0.001). The study reports the new maximum total length (TLmax) for P. lewisi and also records first estimates of length-weight relationships for three major species of snappers from the region. The generated LWR parameters will be of great importance in evaluating the biological changes in fish stocks and for developing sustainable management measures for snappers in the southeastern Arabian Sea.

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