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Age and growth estimates of the Kwangtung skate Dipturus kwangtungensis in the waters of northern Taiwan

Published online by Cambridge University Press:  28 August 2015

Shoou-Jeng Joung
Affiliation:
Department of Environmental Biology and Fisheries Science, 2 Pei-Ning Road, Keelung 202, Taiwan George Chen Shark Research Center, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung 202, Taiwan
Chien-Chi Chen
Affiliation:
Department of Environmental Biology and Fisheries Science, 2 Pei-Ning Road, Keelung 202, Taiwan
Kwang-Ming Liu*
Affiliation:
Institute of Marine Affairs and Resource Management, 2 Pei-Ning Road, Keelung 202, Taiwan George Chen Shark Research Center, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung 202, Taiwan
Tzu-Chi Hsieh
Affiliation:
Department of Environmental Biology and Fisheries Science, 2 Pei-Ning Road, Keelung 202, Taiwan George Chen Shark Research Center, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung 202, Taiwan
*
Correspondence should be addressed to:K.-M. Liu, Institute of Marine Affairs and Resource Management, 2 Pei-Ning Road, Keelung 202, Taiwan email: kmliu@mail.ntou.edu.tw

Abstract

The age and growth of Kwangtung skate, Dipturus kwangtungensis, in the waters off northern Taiwan were estimated from 422 specimens collected between July 2006 and July 2008 at the Tashi fishing market in north-eastern Taiwan. The sexes-combined relationship between total length (TL) and centrum diameter (D) was estimated as follows: TL = 14.11D0.888 (N = 411, r2 = 0.94, P < 0.001). Growth band pairs (comprised of translucent and opaque bands) in vertebrae were determined to form once annually, based on the centrum edge analysis. Up to 14 band pairs were found for both sexes. The von Bertalanffy growth function (VBGF), two-parameter VBGF, the Robertson function, and the Gompertz function were used to fit the observed length-at-age data. The Akaike information criterion corrected indicated that the Gompertz function best fit the observed length at age data. Sex-specific growth functions were not significantly different; the sexes-combined growth parameters were estimated as follows: asymptotic length (L) = 96.7 cm TL, growth coefficient (kG) = 0.144 year−1 and constant (t0) = 5.45 year (N = 364, P < 0.01).

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2015 

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