モクズガニの遡上魚道に関する実験的研究  [in Japanese] Expreiments on Fishways to Enhance the Upstream Migration of the Japanese Mitten Crab Eriocheir japonica D_E H_<AAN>  [in Japanese]

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Abstract

モクズガニ稚ガニを遡上させる魚道の基本的な条件を明らかにするために, V字型の断面を持つ実験水路を製作して実験した。夜間に行った実験では, 勾配20°と50°, 水温20℃と25℃, 表面流速50, 100, 150cm/sでは, モクズガニは水際や飛沫域や流心を活発に遡上した。水温15℃のときには, カニはしばしば水から外に出て歩行した。水温20℃と25℃では, 水が流れていないときには遡上が遅れた。遡上に最も適した条件は勾配20°, 水温25℃, 表面流速100cm/sであったが, この条件では照度にかかわらず遡上した。稚ガニには正の走流性があり, 遡河能力は通し回遊性エビ類よりも高いと判断した。

Basic conditions of fishways for juveniles of the edible catadromous crab <I>Eyiocheir japonica</I> 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, 2002-06-20

    Japanese Society for Aquaculture Science

References:  21

Cited by:  3

Codes

  • NII Article ID (NAID)
    10008750496
  • NII NACSIS-CAT ID (NCID)
    AN00124667
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    03714217
  • NDL Article ID
    6212461
  • NDL Source Classification
    ZR26(科学技術--農林水産--水産)
  • NDL Call No.
    Z18-761
  • Data Source
    CJP  CJPref  NDL  J-STAGE  JASI 
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