Assessment of the Dunnville fishway for passage of walleyes from Lake Erieto the Grand River, Ontario

A Denil fishway in Dunnville, Ontario was built to provide upstream passage for walleyes (Stizostedion vitreum) from Lake Erie to the Grand River. Few walleyes have been observed to use this fishway. Coded radiotelemetry was used to track 24 adult walleyes (12 male, 12 female) downstream from the fi shway to explore reasons for limited use. Activity was monitored by a fixed array of three antennas within the fishway that continuously scanned for s ignals from all radio-tagged fish, and by mobile tracking. In April and May 1997, 17 attempts to use the fishway by 3 male and 2 female radio-tagged w alleyes were recorded. During this period, the attraction efficiency of the Dunnville Fishway was approximately 21%. All attempts rook place between 1 600 and 0600 hours, with most activity near midnight. Walleyes occupied the first resting pool of the fishway for up to 17 h. Subsurface water velocit y during the study was approximately 2 m/s. No radio-ragged walleyes passed through the Dunnville Fishway. Behavior modifying hydraulic conditions inc luding turbulence, entrained air, backcurrents and whirlpools in fishway re sting areas may delay or prevent successful upstream passage of walleyes. T here was also evidence of large-scale movements by walleyes that may have s pawned in the Grand River downstream from Dunnville.