Upriver migration of chum salmon, <I>Oncorhynchus keta</I>, in the Ishikari River

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  • ARUGA Makoto
    Meiji Consultant Co., Ltd.
  • TSUDA Yuichi
    Fisheries Laboratory, Kinki University
  • FUJIOKA Ko
    Graduate School of Science and Technology, Nagasaki University
  • HONDA Kentaro
    Graduate School of Environmental Science, Hokkaido University
  • MITSUNAGA Yasushi
    Faculty of Agriculture, Kinki University
  • MIHARA Kouji
    Ishikari River Development and Construction Department, Hokkaido Regional. Development Bureau, Ministry of Land Infrastructure and Transport
  • MIYASHITA Kazushi
    Field Science Center for Northern Biosphere, Hokkaido University

Bibliographic Information

Other Title
  • 石狩川におけるシロザケＯｎｃｏｒｈｙｎｃｈｕｓ　ｋｅｔａの遡上行動‐テレメトリーシステムの利用‐
  • 石狩川におけるシロザケOncorhynchus ketaの遡上行動--テレメトリーシステムの利用
  • イシカリガワ ニ オケル シロザケ Oncorhynchus keta ノ ソジョウ コウドウ テレメトリー システム ノ リヨウ
  • ―テレメトリーシステムの利用―

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Description

We tracked eight matured chum salmons (Oncorhynchus keta) using acoustic and radio telemetry to understand their upriver migration around ca. 120 to 180 km site starting from the mouth of the Ishikari River in autumn 2002-2004. This study area was divided into the natural levee area, the gorge area, and the basin area including the past major spawning sites until ca. 1940s. Three tagged fish reached to the basin area, and two fish reached to the natural levee area. The maximum duration of the upstream migrationwas 17 days, and the maximum migration distance was 56 km. Mean migration speed in the basin area was 6.6 km/day, where the staying behavior was frequently observed, was approximately three times slower than those of the natural levee area (19.5 km/day) and the gorge area (14.8 km/day). The basin area had better conditions of substrates, depth, flow velocity and subsurface flows for O. keta spawning than the other areas. In addition, groundwater upwelling for egg survival and hatching occurs adequately in the basin area. Their migration patterns reflected geographical differences among three areas. Therefore, the observed slower migration in the basin area was probably due to their pre-spawning behaviors including searching for spawning sites and mates. The faster migration in the natural levee area and gorge areas was due to utilization of these areas as corridors.

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