Biology and exploitation of Trichiurus lepturus Linnaeus from Visakhapatnam waters

Reuben, S and Vijayakumaran, K and Achayya, P and Prabhakar, R V D (1997) Biology and exploitation of Trichiurus lepturus Linnaeus from Visakhapatnam waters. Indian Journal of Fisheries, 44 (2). pp. 101-110.

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    Abstract

    Length-weight relationship, relative condition factor, growth, maturity, mortality, exploitation, fishery, food and feeding and sex ratio of Trichiurus lepturus from Visakhapatnam were studied. Length-weight relationship obtained for male and female was, male : W = 0.000273 L3245862 (r=0.9961) and female : W = 0.000223 L3298627 (r = 0.9950). Growth parameters estimated for von Bertalanffy's growth function were, LM = 106.8251 cm, K = 0.6117 per year and to = -0.1399 years. The fish attained maturity at 42.5 cm and has a longevity of 4.9 years. The total mortality and fishing mortality were estimated as 2.4170 and 1.5236 respectively. The exploitation ratio, E = 0.6304 and exploitation rate, U = 0.5741, indicated overexploited state of the stock. The seasonal abundance in major gears and the annual abundance in the small trawler landings during the decade 1982-'91 are also presented. Growth performance index, PHI1 (<)>') for this species was calculated based on five sets of parameters given by different authors and a mean <(>' value was arrived at. The fish was found to be a voracious carnivore, often exhibiting cannibalism. Incidence of differential fishing noticed in this case is briefly discussed.

    Item Type: Article
    Uncontrolled Keywords: Fish biology; Trichiurus lepturus; Visakhapatnam
    Subjects: Fish and Fisheries > Fish biology
    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: Dr. V Mohan
    Date Deposited: 17 Mar 2010 10:51
    Last Modified: 09 Sep 2015 15:05
    URI: http://eprints.cmfri.org.in/id/eprint/198

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