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2007•Eprints@CMFRI Open Access Institutional Repository (Central Marine Fisheries Research Institute)Open access

Stock assessment of Indian scad, Decapterus russelli (Ruppell, 1830) off Malabar

P P Manojkumar

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Abstract

Stock assessment of Indian scad, Decapterus russelli (Ruppell, 1830) off Malabar was carried out. The Lα and \nK values were 271.2 mm and 1.22 y-1 respectively. The length-weight relationship can be described by the \nequation Log W = -3.2706 +2.6317 Log L. The estimated mortality rates Z, F and M in the species were 3.79 \ny-1, 1.71 y-1 and 2.08 y-1 respectively. Recruitment of this species was continuous with two peaks per year. The \nlength at first capture and length at recruitment were taken as 145 mm and 55 mm respectively. The current \nexploitation ratio (0.49) is below the optimum (0.69) indicating that the resource is under-exploited.

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Stock assessment of Indian scad, Decapterus russelli (Ruppell, 1830) off Malabar was carried out. The Lα and \nK values were 271.2 mm and 1.22 y-1 respectively. The length-weight relationship can be described by the \nequation Log W = -3.2706 +2.6317 Log L. The estimated mortality rates Z, F and M in the species were 3.79 \ny-1, 1.71 y-1 and 2.08 y-1 respectively. Recruitment of this species was continuous with two peaks per year. The \nlength at first capture and length at recruitment were taken as 145 mm and 55 mm respectively. The current \nexploitation ratio (0.49) is below the optimum (0.69) indicating that the resource is under-exploited.

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Available abstract

Stock assessment of Indian scad, Decapterus russelli (Ruppell, 1830) off Malabar was carried out. The Lα and \nK values were 271.2 mm and 1.22 y-1 respectively. The length-weight relationship can be described by the \nequation Log W = -3.2706 +2.6317 Log L. The estimated mortality rates Z, F and M in the species were 3.79 \ny-1, 1.71 y-1 and 2.08 y-1 respectively. Recruitment of this species was continuous with two peaks per year. The \nlength at first capture and length at recruitment were taken as 145 mm and 55 mm respectively. The current \nexploitation ratio (0.49) is below the optimum (0.69) indicating that the resource is under-exploited.

Key concepts: Biology, Stock (firearms), Veterinary medicine, Fishery, Animal science, Geography, Archaeology, Medicine

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