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|Title: ||Age and growth of the whale shark, Rhyncodon typus in the northwestern Pacific|
|Authors: ||Hua-Hsun Hsu;S. J. Joung;Robert E. Hueter;Kwang-Ming Liu|
|Issue Date: ||2016-12-26T08:21:38Z
|Publisher: ||Marine and Freshwater Research|
|Abstract: ||Abstract:This study estimated age and growth of the largest extant fish, the whale shark (Rhincodon typus) by counting vertebral band pairs from 92 specimens comprising 43 males (2.68–9.88m total length [TL]), 30 females (1.60–7.02m TL), and 19 unsexed individuals (2.83–6.67mTL) taken by Taiwanese commercial fisheries during 2001–06. Growth band pairs up to 25 and 42 were counted for a 6.38-m TL female and a 9.88-m TL male, respectively. Using marginal increment ratio and centrum edge analysis, band pairs were postulated to be formed twice a year. The two-parameter von Bertalanffy growth function provided the best fit without significant differences between sexes. Growth parameters were calculated for both sexes as LN¼16.80m TL, k¼0.037 year_1; annual band pair formation would modify these parameters to LN¼15.34m TL, k¼0.021 year_1. Using data reported in another study for 50% size at maturity for males (8.1m TL), and the largest immature and smallest mature females (8.7 and 9.6m TL, respectively) in the Indo-Pacific, these TLs converted to ages at maturity of 17 years for males and 19–22 years for females. The longevity was calculated to be 80.4 years.|
|Relation: ||65(12), pp.1145-1154|
|Appears in Collections:||[環境生物與漁業科學學系] 期刊論文|
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