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CHEN Pi-mao, LI Yong-zhen, YUAN Yu-wen. Demographic analysis of scalloped hammerhead, Sphyrna lewini[J]. South China Fisheries Science, 2006, 2(2): 15-19.
Citation: CHEN Pi-mao, LI Yong-zhen, YUAN Yu-wen. Demographic analysis of scalloped hammerhead, Sphyrna lewini[J]. South China Fisheries Science, 2006, 2(2): 15-19.
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Demographic analysis of scalloped hammerhead, Sphyrna lewini

  • South China Sea Fisheries research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China

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  • Received Date: September 21, 2005
  • Revised Date: November 07, 2005
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    • Abstract

  • Based on the mean age at first maturity tα=5 a, longevity tλ=15 a, average natality b=6.4·a -1, and natural mortality coefficient M=0.279·a -1, demographic analysis was used for estimating a population intrinsic increase coefficient (r0) of 0.265·a -1, a reproductive rate per generation (R0) of 6.212, a generation time (G) of 7.571 years and a population doubling time of 2.616 years under unfished. Demographic parameters such as r0 affected by M were discussed. FC at different first capture age were calculated, and relationship between FC and tC was fitted. The results indicated that FC increased with the first capture age. When tC > 5 a, the population will not decrease with capture.

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    • References (18)
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