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Stock abundance of pelagic fishes around Japan, such as Sardinops melanostictus, Engraulis japonicus and Scomber japonicus have fluctuated drastically, associated with the dynamics of young of the year (YOY). The fluctuations of mortality after the post-larval stage are im portant as a determinant of the YOY abundance. For the assessment of the geographical distribution, abundance, mortality and physical drift of fish in the larval and juvenile stages, it is necessary to use appropriate sampling gears for the fish size coupled with knowledge of their vertical dis tribution. The Kuroshio-Oyashio Transition Area is con sidered to be an important nursery area for pelagic fishes1). Limitation of food due to the abundant competitors will have an impact on the growth and mortality of larvae and juveniles of pelagic fishes, and the competition will be a possible determinant of their YOY abundances. In this paper, we used a newly developed frame trawl and clarified the diet vertical distribution of late larvae and juveniles of abundant pelagic fishes (E. japonicus and Scomber spp.) which have not been previously fully re ported owing to the low catch efficiency of sampling gears, and also describe the vertical distribution of some abundant mesopelagic fishes as potential competitors.

fisheries science

Diel vertical distribution of larvae and juveniles of pelagic and mesopelagic fishes by a newly developed frame trawl in the Kroshio-Oyashio Transition Area in spring