English  |  正體中文  |  简体中文  |  Items with full text/Total items : 27273/39116
Visitors : 2440523      Online Users : 48
RC Version 4.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search
LoginUploadHelpAboutAdminister

Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/25509

Title: Age, growth, and reproduction of silky sharks, Carcharhinus falciformis, in northeastern Taiwan waters
Authors: Shoou-Jeng Joung;Che-Tsung Chen;Hsian-Hau Lee;Kwang-Ming Liu
Contributors: NTOU:Department of Environmental Biology and Fisheries Science
國立臺灣海洋大學:環境生物與漁業科學學系
Keywords: Age and growth;Reproduction;Silky shark;Taiwan
Date: 2008-04
Issue Date: 2011-10-20T08:24:23Z
Publisher: Fisheries Research
Abstract: 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.
Relation: 90(1-3), pp.78–85
URI: http://ntour.ntou.edu.tw/handle/987654321/25509
Appears in Collections:[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

Files in This Item:

File Description SizeFormat
index.html0KbHTML412View/Open


All items in NTOUR are protected by copyright, with all rights reserved.

 


著作權政策宣告: 本網站之內容為國立臺灣海洋大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,請合理使用本網站之內容,以尊重著作權人之權益。
網站維護: 海大圖資處 圖書系統組
DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback