黒潮親潮移行域に分布するマアジ稚魚とスルメイカ幼体の孵化時期と輸送経路の推定

抄録

We described spatial distribution, length frequency compositions and hatching date distributions of juvenile jack mackerel and young Japanese common squid collected from the Kuroshio-Oyashio Transition Zone (KOTZ) in May 2003. Numerical model experiments incorporating geostrophic and wind-driven currents confirmed transport routes of larvae and juveniles of jack mackerel and common squid from their reported major spawning grounds in the East China Sea (and from southern Japan for jack mackerel) to KOTZ. Spatial distribution and length frequency data and numerical transport model results of common squid suggested their northward migration during spring. Jack mackerel distributed in the KOTZ may not recruit to fishing grounds in the central and northern Japan, since their northward migration was not evident and jack mackerel catch in the northern Japan was much smaller than that of common squid.