Population dynamics of Nemipterus japonicus (Bloch) in the trawling grounds off Cochin

Joshi, K K (2010) Population dynamics of Nemipterus japonicus (Bloch) in the trawling grounds off Cochin. Indian Journal of Fisheries , 57 (1). pp. 7-12.

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Abstract

Population dynamics of Nemipterus japonicus (Bloch), the dominant species of threadfin breams fished off Cochin was studied during the period 2000-2002. N. japonicus was dominant during south-west monsoon and its spawning season extended from May to November. The estimated VBGF parameters were Lá= 318 mm, K= 0.69 yr-1(males), and Lá = 265 mm, K= 0.77 yr-1(females) indicating marked growth difference between the two sexes of N. japonicus. The study indicated that the present fishing effort along Cochin has reached an optimum level. The maximum yield in the present level of F can be obtained by increasing the length at first capture by 177 % of the present yield. The reduction in the cod-end mesh size unless stopped will lead to recruitment overfishing over a period of years.

Item Type:Article
Uncontrolled Keywords:Fishery; Growth; Nemipterus japonicus; Population dynamics; Spawning
Subjects:Demersal Fisheries > Threadfin breams
Marine Fisheries > Population Dynamics
Divisions:CMFRI-Cochin > Marine Capture > Demersal Fisheries
ID Code:2342
Deposited By:Dr. V Mohan
Deposited On:11 Aug 2010 11:36
Last Modified:11 Aug 2010 11:36

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