Co-occurrence and the relative abundance of narrow and broad corseletted frigate mackerels Auxis thazard (Lacepede) and Auxis rochei (Risso), around Ceylon

Sivasubramaniam, K (1973) Co-occurrence and the relative abundance of narrow and broad corseletted frigate mackerels Auxis thazard (Lacepede) and Auxis rochei (Risso), around Ceylon. In: Proceedings of the symposium on living resources of the seas around India, 1973, Mandapam Camp.

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Abstract

Both Auxis thazard and A. rochet appear almost always in mixed schools and rarely as independent schools, in the Ceylon waters. The relative proportion of the two species, entering the fishery each year, is dependent more on the size compositions of these species and of the other species in the mixed schools than on area or season. Seasonal and annual variations in the catch rate of those species are discussed. The relative densities of distribution of the frigate mackeiels around Ceylon are given. Size and season of entry of these species into the troll and driftnet fisheries have also been determined. Selectivity of the different types of geais used in Ceylon waters is also discussed in relation to these two species.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:Co-occurrence; relative abundance; Auxis thazard; Auxis rochei; Ceylon
Subjects:Pelagic Fisheries > Tuna fisheries
Divisions:CMFRI-Cochin > Fishery Environment
ID Code:2745
Deposited By:Dr. V Mohan
Deposited On:26 Aug 2010 19:49
Last Modified:26 Aug 2010 19:49

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