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Title: Age and Growth Estimates of the Whitespotted Bamboo Shark, Chiloscyllium plagiosum, in the Northern Waters of Taiwan
Authors: Wei-Ke Chen;Po-Chuan Chen;Kwang-Ming Liu;Shyh-Bin Wang
Contributors: NTOU:Institute of Marine Affairs and Resource Managemen
Keywords: Age and growth;Chiloscyllium plagiosum;von Bertalanffy growth equation;Northern Taiwan
Date: 2007
Issue Date: 2011-10-20T08:21:10Z
Publisher: Zoological Studies
Abstract: abstract:Age and growth rates of the whitespotted bamboo shark, Chiloscyllium plagiosum, were
described from 481 specimens (313 females and 168 males, 35.5-85.0 cm in total length) collected from Feb. 2002 to Feb. 2003 in waters off northern Taiwan on bottom longlines or lobster trap nets. The sex-specific relationships between weight (W) and total length (TL) significantly differed and could be expressed as: W = 1.64 x 10 -3 TL 3.15
(n = 313, p < 0.05) for females and W = 5.09 x 10
-3 TL 2.87 (n = 168, p < 0.05) for males. Age was
determined using vertebral banding patterns. A single growth band (comprising translucent and opaque zones) is formed each year, with up to 7 bands observed for both sexes. A marginal increment ratio analysis indicated that the translucent zone formed from June to Sept. Four growth functions, the traditional von Bertalanffy
(VBGF), VBGF with a fixed size-at-birth (L 0 ), Gompertz, and Robertson functions were used to model the observed length-at-age data. The sex-specific growth equations significantly differed. The traditional VBGF, based on observed length-at-age data, predicted an asymptotic length (L∞ ) of 95.9 cm TL, a growth coefficient (k) of 0.205, a theoretical age at zero length (t 0 ) of -0.95 yr for females; and an L∞ of 100.9 cm TL, k of 0.198, t 0 of -0.90 yr for males. The parameters of VBGF with L 0 set to 15.0 cm were estimated to be an of L∞ 93.2 cm TL and k of 0.224 for females; and an of L∞ 98.5 cm TL and k of 0.212 for males. Akaike
, s information criterion showed that the VBGF with L 0 had the best fit. Ages at maturity estimated from the VBGF with L 0 were 4.5 and
4.4 yr for females and males, respectively.
Relation: 46(1), pp.92-102
URI: http://ntour.ntou.edu.tw/handle/987654321/25060
Appears in Collections:[海洋事務與資源管理研究所] 期刊論文

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