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Alaska Section, American Water Resources Association Michael R. Lilly, Alaska Section AWRA Northern-Region Director I would like to invite you to the October 1998 Brown-Bag presentation by Doug Kane, Water and Environmental Research Center, University of Alaska Fairbanks. Please note this meeting is the second Wednesday in October. Doug's talk will be a presentation on his current research on fish passage in culverts. We look forward to seeing you. Please feel free to bring a colleague to the meeting. We will be sharing our meeting with the Alaska Water Wastewater Management Association (AWWMA) Northern Region section. October 14, 1998 "Juvenile Coho Salmon Swimming Performance In
Culverts" Juvenile coho salmon spend two to three summers in freshwater before traveling to the ocean. The main stream requirement for juvenile coho is habitat with an abundance of food. Because of seasonally fluctuations in streamflow, these fish are often forced to move downstream. The question addressed here is, can these fish move back to upstream habitat if they encounter challenging hydraulic conditions associated with culverts? Challenging hydraulic conditions could be excessive velocities at the inlet, outlet and culvert barrel, turbulence, perched culvert outlets and baffles or weirs. Results of several field studies on the Kenai Peninsula and Prince of Wales Island of juvenile coho movement will be presented. This studied demonstrated that these fish will migrate to upstream food sources and that a variety of strategies are used by the fish to overcome challenging hydraulic conditions. Figure 1. Culvert Inlet Figure 2. Marked and Unmarked Fish Figure 3. Culvert Outlet Figure 4. Twin-Culvert Outlet |
