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Home My WebLink AboutImpacts of In River Hydrokinetics Juvenile Fish ParkerBradley UAF 08-2011-HAssessing potential impacts of in-river hydrokinetics on juvenile fishes Parker Bradley Advisor: Dr. Andy Seitz University of Alaska Fairbanks Picture courtesy of Todd Paris -UAF Background •Possible juvenile fish using river thalweg •Potential overlap in time and space of hydrokinetic devices and juvenile fish migration •Necessary to understand river channel use Goal •Conduct baseline study to assess potential overlap in time and space •Objective –Develop a comparative index of river channel usage by juvenile fishes •River margins •Middle of river channel –Top of water column –Middle water column –Bottom of water column Yukon River 2010 Tanana River 2011 Fyke nets Picture courtesy of Todd Paris -UAF River Margin Methods Picture courtesy of Todd Paris -UAF Frame Trawl Picture courtesy of Todd Paris -UAF Yukon River Mid-channel Methods Tanana River Mid-Channel Methods •Incline Plane Trap –Top of water column Tanana River Mid-Channel Methods Dauble et al. 1989 Tanana River Mid-Channel Methods •Frame Trawl –Top of water column –Middle of water column –Bottom of water column Mid-Channel Challenges Heavy debris Deep river channel ≈30 feet Glacial turbidity Swift current Short open water season “Flashy” discharge rates Yukon River 2010 margin catches •Captured 6,312 fishes •499 total fyke net settings •Longnose Sucker -2,523 •Arctic Grayling -1,932 •Whitefish spp. -1,167 •Chum salmon -336 •Chinook salmon -131 •Lake Chub -90 •Lamprey -77 •Burbot -28 •Inconnu -23 Tanana River 2011 River Margin Catches •Captured 3,896 fishes •329 total fyke net settings •Whitefish spp. -1,512 •Longnose sucker -911 •Chum salmon -774 •Lake Chub -494 •Arctic Lamprey -126 •Arctic Grayling -29 •Chinook /Coho salmon -22 •Burbot -21 •Slimy Sculpin -4 •Western Brook Lamprey -2 •Northern Pike -1 Tanana River 2011 Mid-Channel Surface Catches •Captured 583 fishes •69 total incline plane trap sets •Chinook/Coho salmon -330 •Chum salmon -239 •Whitefish sp. -10 •Arctic Lamprey -3 •Burbot -1 May June July CPUETanana River 2011 CPUEMay June July In Summary… •First documented mid-channel sampling in large glacially influenced Alaskan Rivers •Logistical problems •Development of methodology •Some use margins Longnose Sucker Arctic Grayling Whitefish spp. Chum salmon Chinook salmon Coho Salmon Lake Chub Burbot Inconnu Slimy Sculpin Northern Pike Arctic Lamprey Western Brook Lamprey •Some use middle Chinook Salmon Coho Salmon Chum Salmon Whitefish spp. Arctic Lamprey Burbot •To assess impacts we need to capture fish directly behind hydrokinetic devices Any Questions???