Conference Paper Effects of instillation locations of boulders at bottom of pool-and-weir fishway on migration rate of Zacco platypus

Onitsuka, K.  ,  Akiyama, J.  ,  Ogata, R.

2017-12 , 11th Pacific Symposium on Flow Visualization and Image Processing(PSFVIP-11 )
It is important to keep suitable area by boulders in pooland- weir fishway to make the migration rate of fish high. In this study, migrating behaviors of Zacco platypus in pooland- weir fishway were compared with locations of boulders placed on the bottom of pool-and-weir fishway changed. Migration behaviors of Zacco platypus were obtained with the aid of two digital video cameras. It was found that Zacco platypus migrates remarkably uses the space between boulders when boulders were placed on the upper bottom in the pool. It is because the velocity of space between boulders is low compared to other space.
The 11th Pacific Symposium on Flow Visualization and Image Processing, 2017, 1-3 December, Kumamoto, Japan

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