National Taiwan Ocean University Institutional Repository:Item 987654321/25058
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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/25058

Title: Age and growth estimates of the sharptail mola, Masturus lanceolatus, in waters of eastern Taiwan
Authors: Kwang-Ming Liu;Mei-Ling Lee;Shoou-Jeng Joung;Yung-Chou Chang
Contributors: NTOU:Institute of Marine Affairs and Resource Managemen
國立臺灣海洋大學:海洋事務與資源管理研究所
Keywords: Age and growth;Sharptail mola;Vertebra;Taiwan
Date: 2009-01-14
Issue Date: 2011-10-20T08:21:09Z
Publisher: Fisheries Research
Abstract: abstract:The sharptail mola, Masturus lanceolatus, is one of the largest teleost fishes in the world, and can be found in warm temperate and tropical regions worldwide. The increase of sharptail mola catch in the eastern Taiwan in recent years stimulated a concern that increasing exploitation of this species might lead to a decline of the stock. However, biological information of this species is very limited. Hence, this study provides the first information on age and growth of this species in the waters off eastern Taiwan based on 265 specimens (105 females and 160 males) collected from January 2003 to November 2006 at the Nanfanao and Hualien fish markets, eastern Taiwan. The relationships between whole weight (W) and standard length were expressed as: W = 9.98 × 10−4 SL2.45 (n = 105, p < 0.01) for females, and W = 3.33 × 10−4 SL2.68 (n = 160, p < 0.01) for males. Based on the MIR analysis, growth band pairs (including translucent and opaque bands) in vertebrae formed once a year and were counted up to 23 and 16 for females and males, respectively. Three growth functions, the von Bertalanffy (VBGF), Robertson, and Gompertz, were used to model the observed length at age data. The VBGF had the best fit and predicted an asymptotic length (L∞) = 262.5 cm SL, growth coefficient (k) = 0.046 yr−1, age at zero length (t0) = −3.350 yr (n = 80, p < 0.01) for females, and L∞ = 231.0 cm SL, k = 0.059 yr−1, t0 = −1.852 yr (n = 135, p < 0.01) for males. The longevities were estimated to be 105 and 82 yr based on the VBGF for females and males, respectively.
Relation: 95(2-3), pp.154–160
URI: http://ntour.ntou.edu.tw/handle/987654321/25058
Appears in Collections:[Institute of Marine Affairs and Resource Managemen] Periodical Articles

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