top < Outline of the Nagaragawa Estuary Barrage < Fishways < Attraction-flow-type Fishway

Outline of the Nagaragawa Estuary Barrage

Attraction-flow-type Fishway

The attraction-flow-type fishway is made of attraction flow channels in the center portion and stair fishways (fish ladder portions) on both sides. Fish are tempted by the flowing water in the attraction flow channels, and travel upstream via the fish ladders on both sides. Their behavior can be seen through an observation window.

Structure of stair fishway

Fish heading upstream through the attraction-flow-type fishway(viewed from observation window)

Cobblestone fishway
(the land side of the right bank fish ladder portion)

One of the stair fishways was made as a cobblestone fishway; cobblestones are laid thickly in the pool to facilitate-upstream travel of benthic fishes, shrimps, and crabs.

Ayu migrating upstream at the Nagaragawa Estuary Barrage