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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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Abstract

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 22nd, 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 11°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.

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Authors and Affiliations

  1. College of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, China

    Bilin Liu  (刘必林), Xinjun Chen  (陈新军), Yong Chen  (陈勇), Siquan Tian  (田思泉), Jianhua Li  (李建华), Zhou Fang  (方舟) & Mingxia Yang  (杨铭霞)

  2. The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai, 201306, China

    Bilin Liu  (刘必林), Xinjun Chen  (陈新军) & Siquan Tian  (田思泉)

  3. School of Marine Sciences, University of Maine Orono, Maine, 04469, USA

    Yong Chen  (陈勇)

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  1. Bilin Liu  (刘必林)
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  2. Xinjun Chen  (陈新军)
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  6. Zhou Fang  (方舟)
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  7. Mingxia Yang  (杨铭霞)
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Correspondence to Xinjun Chen  (陈新军).

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Supported by the National Natural Science Foundation of China (No. 41276156), the National High Technology Research and Development Program of China (863 Program) (No. 2012AA092303), the Innovation Program of Shanghai Municipal Education Commission (No. 13YZ091), and Shanghai Leading Academic Disciplin Project

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Liu, B., Chen, X., Chen, Y. et al. Age, maturation, and population structure of the Humboldt squid Dosidicus gigas off the Peruvian Exclusive Economic Zones. Chin. J. Ocean. Limnol. 31, 81–91 (2013). https://doi.org/10.1007/s00343-013-2036-z

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