On Distribution Pattern of Larvae of Paciflc Saury

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  • サンマ子魚の分布様式について
  • サンマ仔魚の分布様式について
  • サンマ シギョ ノ ブンプ ヨウシキ ニ ツイテ

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Abstract

Four repeated observations were conducted in the vicinity of the Izu islands in February and March 1978, in order to understand the movement of larval sauries along the Kuroshio Current. Examination of data distinguishes 18 groups of larvae and juveniles based on positions of occurrence and size composition. Taking estimates of growth rate and flow of the Current into account, seven of 18 groups are classified into three space-time groups are represented by two or three groups which are separated by duration and distance of collections, and differ in modal length shown in parentheses: Spece-time group 1 Group A, first cruise (3 days, 30 miles, 1.7 mm) Group E, second cruise (11 days, 150 miles, 7.2 mm) Group M, third cruise. Space-time group 2 Group B, first cruise (3 days, almost same position, 1.4 mm) Group F, second cruise. Sapce-time group 3 Group D, first cruise (4 days, 95 miles, 2.2 mm) Gioup G, second cruise. When sauries reach the juvenile stage ten days after hatching out, the distribution pattern crumbles, due to change of behavior and transportation by the Kuroshio Current, so that the shahpe of patterns fade. Thus it is almost impossible to trace movement of the fish by that advanced stage.

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