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Diet and sexual maturation of the neon flying squid Ommastrephes bartramii during autumn and spring in the Kuroshio–Oyashio transition region

Published online by Cambridge University Press:  25 March 2008

Hikaru Watanabe ,
Tsunemi Kubodera ,
Taro Ichii ,
Mitsuo Sakai ,
Masatoshi Moku  and
Masaki Seitou
Hikaru Watanabe*
Affiliation:
National Research Institute of Far Seas Fisheries, 2-12-4 Fukuura Kanazawa Yokohama, Kanagawa 236-8648, Japan
Tsunemi Kubodera
Affiliation:
National Science Museum, 3-23-1 Hyakunin-cho Shinjyuku, Tokyo 169-0073, Japan
Taro Ichii
Affiliation:
National Research Institute of Far Seas Fisheries, 2-12-4 Fukuura Kanazawa Yokohama, Kanagawa 236-8648, Japan
Mitsuo Sakai
Affiliation:
National Research Institute of Far Seas Fisheries, 2-12-4 Fukuura Kanazawa Yokohama, Kanagawa 236-8648, Japan
Masatoshi Moku
Affiliation:
National Fisheries University, 2-7-1 Nagata-Honmachi, Shimonoseki, Yamaguchi 759-6595, Japan
Masaki Seitou
Affiliation:
Aomori Prefectural Fisheries Research Center, 384-37 Aza-Naruto Ooaza-Maito-cho Azigasawa Nishi-Tsugaru, Aomori 038-2761, Japan
*
Correspondence should be addressed to: Hikaru WatanabeNational Research Institute of Far Seas Fisheries2-12-4 Fukuura Kanazawa Yokohama Kanagawa 236-8648Japan email: hikaru1@affrc.go.jp
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Abstract

Diet and sexual maturation were examined in the winter–spring cohort of the neon flying squid, Ommastrephes bartramii, during its southward migration through the Kuroshio–Oyashio transition region of the western North Pacific. The main prey items are micronektonic animals and small pelagic fish, which were abundantly distributed throughout the study area. Among the prey species, O. bartramii was dependent on the Japanese anchovy Engraulis japonicus, which also migrate from the northern to southern transition region during the winter, and the micronektonic squid Watasenia scintillans throughout the study period. Other common prey items were Gonatopsis borealis, Diaphus theta, and Ceratoscopelus warmingii from October to November or December, and Tarletonbeania taylori after December. These dietary changes can be explained by the difference in the seasonal north–south migration patterns of the predator and prey species. Male sexual maturation progressed throughout the season, and most individuals were fully mature in January. In contrast, most of the females were immature throughout the study period. The feeding strategy of the squid in relation to their seasonal north to south migration and sexual maturation was discussed.

Keywords

dietsexual maturationneon flying squid Ommastrephes bartramiiwinter–spring cohortKuroshio–Oyashio transition region
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 88 , Issue 2 , March 2008 , pp. 381 - 389
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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