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Title: Age and Growth of the Dusky Shark, Carcharhinus obscurus, in the Western North Pacific Ocean
Authors: S. J. Joung;J. H. Chen;C. P. Chin;Kwang-Ming Liu
Contributors: 國立臺灣海洋大學:環境生物與漁業科學學系
Date: 2015-02
Issue Date: 2016-12-26T08:12:46Z
Publisher: Terrestrial Atmospheric and Oceanic Sciences
Abstract: Abstract:The age and growth of the dusky shark, Carcharhinus obscurus, in the western North Pacific Ocean was estimated based on 434 specimens (213 females and 256 males) collected between September 2002 and November 2003 at the Nanfanao fish market, in northeastern Taiwan. Sex-specific relationships between body weight (W) and total length (TL) were estimated as follows: for females and for males. The relationship between TL and the vertebral centrum radius (R) for both sexes (“sexes-combined” data) was described using the following equation . Growth band pairs (including translucent and opaque bands) in precaudal vertebrae were determined to form once annually, based on centrum edge analysis and verified by statistical analysis. The maximum number of growth band pairs was 29 for females and 24 for males. The Robertson growth function best fit the observed length-at-age data. Sex-specific growth equations were not significantly different; thus, the combined growth parameters for both sexes were estimated as: (asymptotic length [L∞]) = 369.4 cm TL, b = 0.912, growth coefficient = 0.126 yr-1 (n = 385, p < 0.01). Age at maturity was estimated to be 16.6 yr for females and 15.5 yr for males.
Relation: 169
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/39664
Appears in Collections:[環境生物與漁業科學學系] 期刊論文

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