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Gunnison River catch rates as represented by Stratum 12.-- Catch rates of fish (all sizes) in Stratum 12 were as high or higher than any of the Colorado River strata. For forage-size fish, Stratum 12 apparently had the highest catch rate of all strata, although the differences between Stratum 12 and Colorado River strata 7, 8, 9 and 11 were not statistically significant. Three other strata exist in the Gunnison River between the Redlands Diversion Dam (rk 3.5) and the Hartland Diversion Dam at Delta, Colorado (rk 96.4): two downstream and one upstream of Stratum 12 (see Burdick 1995). In the Burdick study, catch rates of fish (all sizes) in the Bridgeport-to-Escalante stratum (Stratum 12 of this study) were somewhat higher than in the two strata immediately downstream, but not as high as in the more upstream stratum (Escalante to Hartland Diversion), though the sampling design did not allow for statistical comparisons. For forage-size fish, data from the Burdick study indicated similar catch rates between all four Gunnison River strata (Figure 4). 5 J w 4 c E 3 E 2 1 0 MBH SUCKER ®FM SUCKER ®WS & HYBRIDS ®RT CHUB BSALMONIDS ®DACE ®CARP Figure 4. Electrofishing catch rates of primary fish groups from four strata in the Gunnison River between the Redlands Diversion Dam (near Grand Junction) and Hartland Diversion Dam (near Delta, Colorado). Catch rates from 1992 and 1993 were averaged. Columns marked `A' represent fish of all sizes; columns marked `B' represent fish 100-300 mm (total length). Data are from a previous FWS study (see text) and are provided here courtesy Bob Burdick. Redl-Whtwt: Redlands Dam to Whitewater, Colorado; Whtwt-Brgpt: Whitewater to Bridgeport crossing; Brgpt-Esclt: Bridgeport crossing to Escalante Creek; Esclt-Hrtld: Escalante Creek to Hartland Dam. The stratum designated Brgpt-Esclt is synonymous with Stratum 12 of this study. 12 Rdl-WhtM WhtM- Brgpt Brgpt-Esclt Esclt-Hrtld Strata