Details

Autor(en) / Beteiligte

• Bunt, Christopher M.
• Cooke, Steven J.
• Scott McKinley, R.

Titel

Assessment of the Dunnville Fishway for Passage of Walleyes from Lake Erie to the Grand River, Ontario

Ist Teil von

• Journal of Great Lakes research, 2000, Vol.26 (4), p.482-488

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2000

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• 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 fishway to explore reasons for limited use. Activity was monitored by a fixed array of three antennas within the fishway that continuously scanned for signals 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 radiotagged walleyes were recorded. During this period, the attraction efficiency of the Dunnville Fishway was approximately 21%. All attempts took place between 1600 and 0600 hours, with most activity near midnight. Walleyes occupied the first resting pool of the fishway for up to 17 h. Subsurface water velocity during the study was approximately 2 m/s. No radio-tagged walleyes passed through the Dunnville Fishway. Behavior modifying hydraulic conditions including turbulence, entrained air, backcurrents and whirlpools in fishway resting areas may delay or prevent successful upstream passage of walleyes. There was also evidence of large-scale movements by walleyes that may have spawned in the Grand River downstream from Dunnville.