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Population structure of the neon flying squid, Ommastrephes bartramii, in the North Pacific Ocean
Yatsu, A.; Tanaka, H.; Mori, J. (1998). Population structure of the neon flying squid, Ommastrephes bartramii, in the North Pacific Ocean, in: Okutani, T. Contributed papers to International Symposium on Large Pelagic Squids, July 18-19, 1996, for JAMARC's 25th anniversary of its foundation. pp. 31-48
In: Okutani, T. (1998). Contributed papers to International Symposium on Large Pelagic Squids, July 18-19, 1996, for JAMARC's 25th anniversary of its foundation. Japan Marine Fishery Resources Research Center: Tokyo. 269 pp., more

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Keyword
    Marine

Authors  Top 
  • Yatsu, A.
  • Tanaka, H.
  • Mori, J.

Abstract
    Neon flying squid populations in the North Pacific Ocean consist of an autumn cohort (formally known as LL- group) and a winter-spring cohort (L, S, SS groups combined) based on age estimation from statolith microstructure and mantle length compositions. Both cohorts are estimated to have a one year life span. The winter-spring cohort can be further separated into a western stock and a central-eastern stock on the basis of infection intensity of nematode and cestode parasites, mantle length compositions, and geographic distribution of paralarvae of neon flying squid. The autumn cohort was abundant in the central and eastern North Pacific but rare west of 170°E which coincides with the location of the Emperor Seamount Chain north of 35°N. The autumn cohort is also separable into central and eastern stocks on the basis of parasite infection intensity .

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