Age and growth of chub mackerel (Xcomber japonicus) in the East China and Yellow Seas using sectioned otolith samples |
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| Authors: | Gang Li Xinjun Chen Bo Feng |
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| Institution: | (1) College of Marine Sciences, Shanghai Ocean University, Shanghai, 200090, P. R. China;(2) The Key Laboratory of Shanghai Education Commission for Oceanic Fisheries Resources Exploitation, Shanghai, 200090, P. R. China;(3) College of Fisheries, Guangdong Ocean University, Zhanjiang, 524006, P. R. China |
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| Abstract: | Although chub mackerel (Scomber japonicus) is a primary pelagic fish species, we have only limited knowledge on its key life history processes. The present work studied
the age and growth of chub mackerel in the East China and Yellow Seas. Age was determined by interpreting and counting growth
rings on the sagitta otoliths of 252 adult fish caught by the Chinese commercial purse seine fleet during the period from
November 2006 to January 2007 and 150 juveniles from bottom trawl surveys on the spawning ground in May 2006. The difference
between the assumed birth date of 1st April and date of capture was used to adjust the age determined from counting the number
of complete translucent rings. The parameters of three commonly used growth models, the von Bertalanffy, Logistic and Gompertz
models, were estimated using the maximum likelihood method. Based on the Akaike Information Criterion (AIC), the von Bertalanffy growth model was found to be the most appropriate model. The size-at-age and size-at-maturity values
were also found to decrease greatly compared with the results achieved in the 1950s, which was caused by heavy exploitation
over the last few decades. |
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| Keywords: | Scomber japonicus age growth otolith East China and Yellow Seas |
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