. The Big Blackfoot River restoration progress report for 2002 and 2003 . Fish populations; Fishes; Fishery management; Trout fisheries; Stream ecology; Blackfoot River (Mont. ). CPUE/Estimate Regression 1990-2003 250 n y = Fe = 200 ? ''^ 150 V ^ 1 100 u. J^<<^^^^ 50- 0 ? ? Ij*:!*^''^^ p = < D 20 40 60 80 100 95% confidence interval = N ± (Standard deviation). The 95% confidence intervals for these estimates are found in Appendix B. For small stream population assessments, we also used a single pass catch-per- unit effort (CPUE) method, which provides a
. The Big Blackfoot River restoration progress report for 2002 and 2003 . Fish populations; Fishes; Fishery management; Trout fisheries; Stream ecology; Blackfoot River (Mont. ). CPUE/Estimate Regression 1990-2003 250 n y = Fe = 200 ? ''^ 150 V ^ 1 100 u. J^<<^^^^ 50- 0 ? ? Ij*:!*^''^^ p = < D 20 40 60 80 100 95% confidence interval = N ± (Standard deviation). The 95% confidence intervals for these estimates are found in Appendix B. For small stream population assessments, we also used a single pass catch-per- unit effort (CPUE) method, which provides an index of trout abundance (Appendix A). For this CPUE. we also developed simple linear regressions (for fish ;) to help predict densities from CPUE (Figure 9). These regressions show a significant correlation between CPUE and density (P= <). Small stream size and highly efficient electrofishing conditions in study streams contributed to this outcome. Although these regressions demonstrate CPUE to be an index to population density, CPUE does not include a confidence interval like the actual population density estimate. For this report, CPUE refers to the number of fish collected in a single electrofishing pass and is adjusted per 100' of stream ( CPUE of 8 means 8 fish captured per 100' of sampled stream). Actual population estimates are referred to as density/100'. CPUE/Estimate Regression 1990-2003 y= R^ = Figure 9. Regressions used to predict densities from CPUE for fish ; (bottom). Fish were captured using a boat or backpack mounted electrofishing unit. In small streams, we used a battery powered (Smith/Root) backpack mounted DC electrofishing unit. The anode (positive electrode) was a hand-held wand equipped with a 1-foot-diameter hoop; the cathode (negative electrode), a braided steel wire. On the Blackfoot River and Monture Creek, we used an aluminum drift boat mounted with a Coffelt Model VVP-15 rectifier and 5,000 wa
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Keywords: ., bhlcoll, bookcollectionamericana, booksubjectfishes, bookyear2004
