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Age, growth and population structure of jumbo flying squid, Dosidicus gigas, based on statolith microstructure off the Exclusive Economic Zone of Chilean waters

Published online by Cambridge University Press:  04 October 2010

Xinjun Chen ,
Huajie Lu ,
Bilin Liu  and
Yong Chen
Xinjun Chen*
Affiliation:
College of Marine Sciences, Shanghai Ocean University, Hucheng Ring Road 999, Lingang New City, Shanghai, China, 201306 The Key Laboratory of Shanghai Education Commission for Oceanic Fisheries Resources Exploitation, 999 Hucheng Ring Road, Shanghai 201306, China The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, 999 Hucheng Ring Road, Shanghai 201306, China
Huajie Lu
Affiliation:
College of Marine Sciences, Shanghai Ocean University, Hucheng Ring Road 999, Lingang New City, Shanghai, China, 201306
Bilin Liu
Affiliation:
College of Marine Sciences, Shanghai Ocean University, Hucheng Ring Road 999, Lingang New City, Shanghai, China, 201306 The Key Laboratory of Shanghai Education Commission for Oceanic Fisheries Resources Exploitation, 999 Hucheng Ring Road, Shanghai 201306, China The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, 999 Hucheng Ring Road, Shanghai 201306, China
Yong Chen
Affiliation:
The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, 999 Hucheng Ring Road, Shanghai 201306, China School of Marine Sciences, University of Maine, Orono, Maine 04469, USA
*
Correspondence should be addressed to: X. Chen, College of Marine Sciences, Shanghai Ocean University, Hucheng Ring Road 999, Lingang New City, Shanghai, China, 201306 email: [email protected]
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Abstract

The jumbo flying squid, Dosidicus gigas, support an important squid fishery off the Exclusive Economic Zone of Chilean waters. However, we only have limited information about their biology. In this study, age, growth and population structure of D. gigas were studied using statoliths from 533 specimens (386 females and 147 males) randomly sampled in the Chinese squid jigging surveys from 2007 to 2008 off the Exclusive Economic Zone of Chile. Mantle lengths (MLs) of the sample ranged from 206 to 702 mm, and their ages were estimated from 150 to 307 days for females and from 127 to 302 days for males. At least two spawning groups were identified, the main spawning peak tended to occur between August and November (austral spring group), and the secondary peak appeared during March to June (austral autumn group). The ML–age relationship was best modelled by a linear function for the austral spring group and a power function for the austral autumn group, and the body weight (BW)–age relationship was best described by an exponential function for both the groups. Instantaneous relative growth rates and absolute growth rates for ML and BW did not differ significantly between the two groups. The growth rate of D. gigas tended to be high at young stages, and then decreased after the sub-adult stage (>180 days old). This study suggests large spatial and temporal variability in key life history parameters of D. gigas, calling for the collection of more data with fine spatial and temporal scales to further improve our understanding of the fishery biology of D. gigas.

Keywords

Dosidicus gigasstatolithage and growthpopulation structureoff Exclusive Economic Zone of Chilean waters
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 91 , Issue 1 , February 2011 , pp. 229 - 235
Copyright
Copyright © Marine Biological Association of the United Kingdom 2010

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