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题名: Age, growth, and reproduction of silky sharks, Carcharhinus falciformis, in northeastern Taiwan waters
作者: Shoou-Jeng Joung;Che-Tsung Chen;Hsian-Hau Lee;Kwang-Ming Liu
贡献者: NTOU:Department of Environmental Biology and Fisheries Science
关键词: Age and growth;Reproduction;Silky shark;Taiwan
日期: 2008-04
上传时间: 2011-10-20T08:24:23Z
出版者: Fisheries Research
摘要: abstract:To examine the age, growth and reproduction of silky sharks, Carcharhinus falciformis, in the waters off northeastern Taiwan, 469 specimens (213 females and 256 males) were collected from August 2000 to January 2002 at the Nanfanao fish market, northeastern Taiwan. The relationship between body weight (W) and total length (TL) for both sexes combined was expressed as: W = 2.92 × 10−6 TL3.15 (n = 469, p < 0.01). The relationship between TL and vertebral centrum radius (R) for both sexes combined data was estimated as: TL = 25.979 + 18.197R (n = 250, p < 0.01). Growth bands (including translucent and opaque zones) in precaudal vertebrae formed once a year between December and January and were counted up to 11 and 14 for females and males, respectively. The von Bertalanffy growth function (VBGF) was used to model the observed length at age data. The sexes combined VBGF predicted an asymptotic length (L∞) = 332.0 cm TL, growth coefficient (k) = 0.0838 year−1, age at zero length (t0) = −2.761 year (n = 250, p < 0.01). Size at 50% maturity for males was estimated to be 212.5 cm based on the logistic curve, which corresponded to 9.3 years. Females matured at 210–220 cm, which correspond to 9.2–10.2 years. The length at birth was estimated to be 63.5–75.5 cm TL. The number of embryos per litter was 8–10 and sex ratio of embryos was 1:1.
關聯: 90(1-3), pp.78–85
显示于类别:[海洋事務與資源管理研究所] 期刊論文
[環境生物與漁業科學學系] 期刊論文


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