Rearing of Juvenile Masu Salmon in a Side-channel Excavated inside River Reservation in the Jinzu River.

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  • 神通川の河川敷を利用したサクラマス幼魚の育成
  • ジンツウガワ ノ カセンシキ オ リヨウ シタ サクラ マス ヨウギョ ノ イクセイ

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Abstract

Rearing of juveniles of the masu salmon, Oncorhynchus masou, in a side-channel excavated inside a river reservation was conducted in the Jinzu River from April to October during 1995 to 1997. The side-channel was 157 m long, 5-6 m wide and 0.6-1.2 m deep. The number of juveniles reared initially was 200 thousands (2.9 g in average body weight), 570 thousands (0.7 g) and 230 thousands (4.1 g) each year. Juveniles grew up to 16.7 g, 17.1 g and 15.2 g in body weight as of October of each year. Fork length, body weight and condition factors of juveniles reared in the side-channel were larger than those reared in the Jinzu Hatchery as of the month of October. Many juveniles fed on terrestrial insects that fell on the surface of the water in addition to artificial foods. The returning rate of marked juveniles released from the channel into the Jinzu River was estimated to be 0.24% in 1997, and this rate was almost equal to those released as fingerlings and smolts which were reared and released from the Jinzu hatchery from 1990 to 1995. It is considered that rearing masu salomon juveniles in side-channels inside river reservation is one of the most effective ways to propagate a masu salmon resource.

Journal

  • Aquaculture Science

    Aquaculture Science 48 (3), 489-495, 2000

    Japanese Society for Aquaculture Science

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