The perch fishery by traditional traps at Kilakarai (Gulf of Mannar) and some aspects of biology of Lethrinus nebulosus (Forskal)

Ameer Hamsa, K M S and Mohamad Kasim, H (1994) The perch fishery by traditional traps at Kilakarai (Gulf of Mannar) and some aspects of biology of Lethrinus nebulosus (Forskal). CMFRI Bulletin-Perch fisheries in India, 47 . pp. 98-105.

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Abstract

Exploitation of perch resources off Kilakarai in the Gulf of Mannar, by traditional traps is studied. The increase in perch landings and the change in succession of species are attributed to the change in mode of operation, area of operation and increase in the usage of prawn peeUngs predominantly as baits in place of traditional baits. The biology of the dominant species Lethrinus nebulosus is studied. The age and growth of this species is described from the length frequency data collected from the landings of perch traps. The length-weight relationship and food and feeding are dealt in detail. The mortality coefficient namely natural (M), total (Z) and fishing (F), exploitation rate (U) and yield per recruit in relation to different F, M/K ratios keeping the age at first capture constantly at the prevailing level (0.2913 yr) have been estimated to assess the present status of the fishery of this species. It is inferred that this species is exposed to higher fishing intensity by the perch trap units as the prevailing fishing mortality coefficients are higher than the F ^ , which can bring about the yield max for the prevailing M/K ratio. This finding is attributed as one of the possible reasons for the continued decline in the percentage composition of L. nebulosus in the perch trap landings since 1950s.

Item Type:Article
Uncontrolled Keywords:perch fishery; traditional traps; Kilakarai; Gulf of Mannar; biology; Lethrinus nebulosus
Subjects:Demersal Fishes > Perch fishes
Divisions:CMFRI-Cochin > Marine Capture > Demersal Fisheries
ID Code:2949
Deposited By:Dr. V Mohan
Deposited On:31 Aug 2010 12:41
Last Modified:31 Aug 2010 12:41

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