Experiments on Fishways to Enhance the Upstream Migration of the Japanese Mitten Crab Eriocheir japonica De Haan.

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  • HAMANO Tatsuo
    Department of Applied Aquabiology, National Fisheries University
  • KATSUMATA Ryosuke
    Department of Applied Aquabiology, National Fisheries University
  • MIYA Yasuhiko
    Department of Environmental Studies, Faculty of Environmental Studies, Nagasaki University
  • YASUDA Youichi
    Department of Civil Engineering, College of Science and Technology, Nihon University

Bibliographic Information

Other Title
  • モクズガニの遡上魚道に関する実験的研究
  • モクズガニ ノ ソジョウ ギョドウ ニ カンスル ジッケンテキ ケンキュウ

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Abstract

Basic conditions of fishways for juveniles of the edible catadromous crab Eyiocheir japonica to migrate to upstream habitats from estuary by walking, were studied using an experimental waterway with V-shaped floor. Crabs actively walked at the water's edge, splash zone, and in the central submerged area in the stream and successfully passed through the waterway at slopes of 20 and 50°, water temperatures of 20 and 25°C and surface current velocities of 50, 100, and 150 cm/s during the nighttime. In 15°C, crabs frequently climbed out of the water. No current flow (0 cm/s) caused a delayed migration at 20 and 25°C. Crabs also were found to migrate up the waterway at various light intensities, 0-103, 080 lx under the best conditions for its upstream migration of 20° slope, 25°C water temperature, and 100 cm/s surface current velocity. The crab shows the positive rheotaxis and its locomotory ability is larger than those of diadromous freshwater shrimps.

Journal

  • Aquaculture Science

    Aquaculture Science 50 (2), 143-148, 2002

    Japanese Society for Aquaculture Science

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