The Effects of Redd Site Selection and Redd Geometry on the Survival of Incubating Okanagan Sockeye Eggs
This study explores the spawning process of Okanagan sockeye salmon ( Oncorhynchus nerka). Natural and channelized reaches supporting spawning sockeye were studied for suitability as spawning grounds. The scope of this work is two-fold. Firstly, hydraulic characteristics found at redd sites in spawning grounds were measured for depth, velocity, and two flow parameters, the Froude and Reynolds numbers. Only Froude numbers (Fr = 0.315 +/- 0.10) were found to be similar between the two reaches implicating this characteristic as selected for by spawning sockeye. The natural reach contained this range of Froude numbers in both years sampled, where the channelized reach contained this range during lower than average discharge.
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