Biology and exploitation of Trichiurus lepturus Linnaeus from Visakhapatnam waters
CMFRI Repository
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Relation |
http://eprints.cmfri.org.in/198/
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Title |
Biology and exploitation of Trichiurus lepturus Linnaeus from Visakhapatnam waters |
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Creator |
Reuben, S
Vijayakumaran, K Achayya, P Prabhakar, R V D |
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Subject |
Fish biology
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Description |
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. |
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Publisher |
CMFRI/ICAR
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Date |
1997
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Type |
Article
PeerReviewed |
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Format |
application/pdf
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Language |
en
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Identifier |
http://eprints.cmfri.org.in/198/1/Article_03.pdf
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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