Length-weight relationship, feeding traits and nutritional value of mahi mahi (Coryphaena hippurus) in the south-eastern Arabian Sea

Abstract

Aim: The present study was conducted to investigate the length-weight relationship, food and feeding behaviour and proximate composition of an oceanic epipelagic fish, Coryphaena hippurus landed along Karnataka, south-eastern Arabian Sea. Methodology: Length-weight relationship, feeding and proximate composition of C. hippurus was studied for a period of one year. The size composition, feeding intensity, frequency, occurrence and index of relative importance (IRI) was determined for each diet component in the stomach. Monthly proximate composition in the dolphin fish was estimated. Results: The fork length of the specimens of C. hippurus collected along Karnataka coast ranged from 30- 123 cm and fishes having length range from 33-73 cm represented 79% of the total fish sampled. The estimated b values of C. hippurus for both males and females were less than 3 which indicated negative allometric growth; the fish grows faster in length than weight. The most dominant item recorded in the gut of C. hippurus was pelagic and mesopelagic teleosts. Cephalopods (squids, cuttlefish and octopus) were the second important food constituent while crustaceans consisting of crabs and shrimps formed very less quantity. Interpretation: Information on length-weight relationship, feeding behaviour and proximate composition of mahi mahi would be useful for developing suitable management plans for the conservation and judicious exploitation of this commercially important resource.