Sampling by seine and fish processing procedure followed in 1999 was similar to that in 1997 and 1998 (Maslin, et al., 1997), Maslin, et al., 1998). Since we were focusing on the lower ends of tributaries this year, we had to make modifications to accommodate the different habitat found there. The lower ends of many of the tributaries were formed from abandoned river channels or by the growth of river point bars elongating the creek. These reaches are usually wide, slow, and contain many snags and stands of aquatic vegetation. Some, particularly the abandoned river channels, are deep and all may become too deep for sampling due to backwater effects from high river stages. Because of the obstacles to sampling, we were unable to use depletion analysis to estimate total number of juvenile salmon present. Instead we determined the area seined by dividing it into simple geometric figures and making appropriate measurements. We then calculated the catch-per-unit-effort as a statistic for comparing relative abundance. Upstream areas were sampled in the same manner in an attempt to provide comparable data.
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Last Updated August 30,1999