Age and growth of the blue shark (Prionace glauca) in the North Atlantic Ocean

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Age and growth of the blue shark (Prionace glauca) in the North Atlantic Ocean
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Affiliation:College of Marine Science,Shanghai Ocean University;The Key Laboratory of Oceanic Fisheries Resources Exploitation of Shanghai Education Commission,College of Marine Science,Shanghai Ocean University;The Key Laboratory of Oceanic Fisheries Resources Exploitation of Shanghai Education Commission,College of Marine Science,Shanghai Ocean University;The Key Laboratory of Oceanic Fisheries Resources Exploitation of Shanghai Education Commission,College of Marine Science,Shanghai Ocean University;The Key Laboratory of Oceanic Fisheries Resources Exploitation of Shanghai Education Commission
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A total of 524 (328 males, 196 females) blue sharks were sampled from tuna long line fishery survey in the northwest Atlantic Ocean(48° to 52°N/15° to 34°W , 3° to 15°N/34° to 40°W) from October 2010 to March 2011. Whole vertebrae of 51 males (104~254cmFL) and 52 females (135~211cmFL) were analyzed. The results showed that the relationship between fork length (FL) and vertebral radius (VR) for both sexes was as follows: FL=192.8VR0.837(n=117,R2=0.90). Estimating the vertebral growth rings used 10% cobalt nitrate. Males were aged to 9 years (256cm FL) and females were 7years (211cm FL). The index of average percentage error (IAPE) ranged from 0~6.33% for 2~9years. Parameters derived from observed length-at-age for males and back-calculated lengths for females were best to describe the growth of the blue shark, respectively. Von Bertalanffy growth parameters were L∞=330.4 cm FL, k=0.15 yr-1, t0=-0.64 yr for males, and L∞=295.7 cm FL, k=0.14 yr-1, t0=-0.62 yr for females. The longevity for males and females was 20years and 21years, respectively.

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高春霞,戴小杰,陈彦,朱江峰.北大西洋大青鲨年龄和生长研究[J].上海海洋大学学报,2013,22(1).
Gao chunxia, Dai xiaojie, Chen yan, Zhu jiangfeng. Age and growth of the blue shark (Prionace glauca) in the North Atlantic Ocean[J]. Journal of Shanghai Ocean University,2013,22(1).

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Received:August 05,2012
Revised:October 28,2012
Adopted:November 20,2012
Online: November 07,2013
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