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

作　　者：刘必林 陈新军 陈勇 田思泉 李建华 方舟 杨铭霞 

机构地区：[1]College of Marine Sciences,Shanghai Ocean University [2]The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources,Ministry of Education [3]School of Marine Sciences,University of Maine Orono

出　　处：《Chinese Journal of Oceanology and Limnology》2013年第1期81-91,共11页中国海洋湖沼学报（英文版）

基　　金：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);Shanghai Leading Academic Disciplin Project;supported by National Distant-Water Fisheries Engineering Research Center, and Scientific Observing and Experimental Station of Oceanic Fishery Resources, Ministry of Agriculture;Yong Chen’s involvement in the project was supported by the Shanghai Dongfang Scholar Program

摘　　要：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.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 22 nd , 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.

关 键 词：Dosidicus gigas offPeruvian EEZ age MATURATION population structure STATOLITH 

分 类 号：S931.1[农业科学—渔业资源]