Fishery, Growth, Mortality Rates and Stock Assessment of Auxis thazard (Lacepede) Along Tuticorin Coast, Gulf of Mannar

Mohamad Kasim, H (2000) Fishery, Growth, Mortality Rates and Stock Assessment of Auxis thazard (Lacepede) Along Tuticorin Coast, Gulf of Mannar. In: The Fifth Indian Fisheries Forum Proceedings, 17-20 January, 2000, Bhubaneswar, Orissa.

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    Abstract

    Paruvalai. a drift gillnet with mesh size ranging from 90 to 170 mm exploits the tuna resource more effectively (98%) than the podivalai, another type of drift gillnet with mesh size 40-70 mm, and hooks and lines. Among the seven species. Auxis thazard (Lacepede) was the second dominant species next to Euthyiznus affinis (Cantor) forming 40.2% of the total tuna production by paruvalai. The Lα and K are estimated to be 49 cm and I .3/yr, respectively for males and 51.2 cm and 1.3/yr, respectively for females of A. tllazard. The natural mortality rate (M) is estimated to be 1.85 for males and 1.82 for females. The total mortality coefficient (Z) is estimated to vary from 4.88 in 1992-93 to 7.07 in 1993-94 with an average of 5.55 for males and from 3.53 in 1995-96 to 5.94 in 1992-93 with an average of 4.85 for females. The fishing mortality rate (F) ranged from 3.03 in 1992-93 to 5.22 in 1993-94 with an average of 3.70 for males and from 1.71 in 1995-96 to 4.12 in 1992-93 with an average of 3.03 for females. The exploitation rate (U) ranged from 0.62 in 1992- 93 to 0.74 in 1993-94 with an average of 0.66 for males and from 0.47 in 1995-96 to 0.69 in 1992-93 with an average of 0.62 for females. Average annual yield of A. thazard is estimated to be 288 t during 1992-97 and the average annual stock (P) is estimated to be 429.9

    Item Type: Conference or Workshop Item (Paper)
    Uncontrolled Keywords: Fishery; growth; mortality rate; stock assessment; Auxis thatard
    Subjects: Marine Fisheries > Stock Assessment
    Pelagic Fisheries > Tuna fisheries
    Marine Fisheries > Population Dynamics
    Divisions: CMFRI-Kochi > Marine Capture > Pelagic Fisheries
    Subject Area > CMFRI Brochures > CMFRI-Kochi > Marine Capture > Pelagic Fisheries
    CMFRI-Kochi > Marine Capture > Pelagic Fisheries
    Depositing User: Users 171 not found.
    Date Deposited: 30 Oct 2010 10:58
    Last Modified: 09 Sep 2015 15:28
    URI: http://eprints.cmfri.org.in/id/eprint/4551

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