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Age, maturation, and population structure of the Humboldt squid Dosidicus gigas off the Peruvian Exclusive Economic Zones

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Chinese Journal of Oceanology and Limnology 2013年第1期31卷 81-91页

作者：刘必林陈新军陈勇田思泉李建华方舟杨铭霞 College of Marine Sciences Shanghai Ocean University The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources Ministry of Education School of Marine Sciences University of Maine Orono

Age, maturation and population structure of the Humboldt squid Dosidicus gigas were studied based on random sampling of the Chinese jigging fishery off the Peruvian Exclusive Economic Zones （eez） during 2008-2010. Estimated ages ranged from 144 to 633 days, confirming that the squid is a short-lived species with longevity no longer than 2 years. Occurrence of mature females and hatching in each month indicated that Humboldt squid spawned year-round. Back-calculated hatching dates for the samples were from January 22^nd, 2008 to April 22nd, 2010 with a peak between January and March. Two size-based and two hatching date-based populations could be defined from mantle length （ML） at maturity and back-calculated hatching dates, respectively. Females matured at a larger size than males, and there was a significant difference in ML at maturity between the two hatching groups （P〈0.05）. The waters adjacent to 1 l^S off the Peruvian eez may be a potential spawning ground. This study shows the complexity of the population structure and large variability in key life history parameters in the Humboldt squid off the Peruvian eez, which should be considered in the assessment and management of this important resource.

关键词： Dosidicus gigas offperuvian eez age maturation population structure Statolith

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