Author(s): Juichi Kamimura; Susumu Sakai; Toshiro Sanematsu

Linked Author(s):

Keywords: Estuary barrage; Fishway; Monitoring; Nagara river

Abstract: Studies on the fishways of Nagaragawa Estuary Barrage and migratory fish species that passed the barrage have conducted when the estuary barrage project was planned, before and during the construction of the barrage, and before the barrage went into operation. After the barrage went into operation, its monitoring started, and it is still being carried on. The studies conducted at the planning stage and before the commencement of barrage construction yielded information on the habitats and behavior of fish species. Based on the ecological information seed production techniques were developed for ayu (sweetfish) and satsukimasu salmon, which were likely to be affected by barrage operation. Through subsequent studies conducted during the construction of the barrage, knowledge was gained about the habitat of migratory bottom fish species, and the type of fishway structure to be adopted was determined according to the study results. Before the gates went into operation, findings from the studies and deliberations conducted thus far were verified through test operations. In the monitoring of the estuary barrage after it went into service, the migratory behavior of fish species likely to be affected by barrage operation were studied, and effectiveness of the fishways was confirmed.

DOI:

Year: 2005