Length–weight relationship, sex ratio, condition and relative condition factor of Giant trevally (Caranx ignobilis)

Tomy, Elezebath and Abdussamad, E M and Thomas, Toji and Gopinath, Ashly (2023) Length–weight relationship, sex ratio, condition and relative condition factor of Giant trevally (Caranx ignobilis). Journal of Aquatic Biology and Fisheries, 11 (1). pp. 193-197. ISSN 2321–340X

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Abstract

The study describes the main biological characteristics such as length-weight relationship, sex ratio, Fulton condition factor ‘F’ and relative condition factor ‘Kn’ for Caranx ignobilis along the southwest coast of India during 2018-2020. The length-weight relationship for C.ignobilis was analyzed by the cube law and was found to be 0.0219, 2.86, and 0.9534 respectively for a, b, and r values. The value of r obtained from the relation W=a Lb holds a strong relationship with the length and weight. The sex ratio of C.ignobilis was found to be 1:0.7 which was slightly biased towards males with Chi-square showing a significant difference (p<0.05) from the expected ratio of 1:1.Fulton condition factor studied for the species at different months varied from 1-1.9 with an average of 1.3 implies an overall biological condition of the fish in good health. The observed result of the relative condition factor of C.ignobilis is also found to be > 1 which signifies the good health condition of the species in its present habitat.

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