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Fishery and diet composition of the cobia Rachycentron canadum (Linnaeus, 1766) exploited along Karnataka coast

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Title Fishery and diet composition of the cobia Rachycentron canadum
(Linnaeus, 1766) exploited along Karnataka coast
 
Creator Rohit, Prathibha
Bhat, S Uma
 
Subject Cobia
Fishery biology
 
Description The fishery and food of cobia, Rachycentron canadum caught off Karnataka, south-west coast of India was studied during
2007-2010. An estimated 302 t was landed annually along this coast which formed 0.1% of the total fish catch of the region.
Peak landings were recorded during October followed by April. Gillnets landed large sized cobia and contributed to the bulk
of the catch (53%). Maximum catch by this gear was during September-October. Next dominant gear was trawl which landed
fishes of all size groups with maximum catch during April-May. Trawl landings contributed 45% of the total cobia landings.
The fishery was comprised of fishes of length range 26 - 125 cm TL with the mean at 58 cm. Juveniles dominated the catch.
Contents of 177 non-empty stomachs were analysed for the index of relative importance (IRI) and prey specific abundance
(PSA). R. canadum was found to be nonselective generalist carnivore feeder, foraging on micronektonic pelagic or benthic
organisms (crustaceans, fish and molluscs) available in the epipelagic waters. Teleost fish (55%), crustaceans (35%) and
molluscs (10%) contributed to the diet. Decapterus russelli (18.0%) and Encrasicholina devisi (10.0%) were the dominant
finfish groups; Acetes sp. (21.1%) followed by crabs (Charybdis spp. and Portunus spp.) with an IRI of 12.9% were dominant
among crustaceans and squids (Loligo spp.) (5.8%) and octopus (4.1%) comprised the dominant molluscans prey items.
 
Publisher Central Marine Fisheries Research Institute
 
Date 2012
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/9310/1/91.pdf
Rohit, Prathibha and Bhat, S Uma (2012) Fishery and diet composition of the cobia Rachycentron canadum (Linnaeus, 1766) exploited along Karnataka coast. Indian Journal of Fisheries, 59 (4). pp. 61-65.