Journal of Dalian Ocean University  2009, Vol. 24 Issue (3): 206-212 DOI: 10.3969/j.issn.1000-9957.2009.03.004 |
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| Age, growth and population structure of squid Sthenoteuthis oualaniensis in northwest Indian Ocean by statolith microstructure |
| LIU Bi-lin, CHEN Xin-jun, ZHONG Jun-sheng
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| 1. College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China ;2. The Key Laboratory of Shanghai Education Commission for Oceanic Fisheries Resources Exploitation,Shanghai Ocean University,Shanghai 201306 ,China; 3. College of Fisheries and Life,Shanghai Ocean University, Shanghai 201306, China |
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Abstract The age and growth of squid Sthenoteuthis oualaniensis were studied using 104 statoliths collected in the Chinese squid jigging surveys from October 2004 to January 2005. It was found that the squid had a life span of about one year, the samples being 88 to 363 day old, 81.3% ranging from 180 to 270 day old. The incubation samples were found almost throughout the year from January to November in 2004, with two peaks of March to May and September to October, accounting for 57.8% and 14.4% of the total, respectively. Two distinct spawning groups were observed in spring and autumn. The relationship between mantle length and age was described by the linear function and the relationship between body weight and age the exponent functions in the two spawning groups. The instantaneous relative growth rate and absolute growth rate were found to be varied with the sizes, with significant difference between the groups of squid with the same age.
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Published: 30 December 2016
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