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<br />3. One Colorado pikeminnow that ascended the fish ladder 2 July <br />was recaptured 5 August approximately 30 miles upstream in <br />the Gunnison River. <br /> <br />4. A total of 7.598 fish were trapped and counted in the <br />Redlands Diversion Dam fishway between 16 March and 28 <br />October (Appendix: Table 1). Native fishes comprised 93X of <br />the total number of fishes collected in 1997, compared to 94X <br />to that each in 1996 and 1997. Bluehead sucker comprised 55X <br />of the catch. and bluehead sucker. 30X. Channel catfish <br />comprised the largest number of nonnative fish (2X) , white <br />sucker the second most. 1%. The number of channel catfish <br />collected in the fish trap has increased in three years: in <br />1996 there were 24, in 1997 there were 94. and in 1998 there <br />were 157. No northern pike. largemouth or smallmouth bass <br />were captured. <br /> <br />5. The total number of all fishes that used the fish ladder in <br />1998 decreased by 4.937 (38X) from 1997 (Table 1). The <br />number of native fishes that used the fish ladder in 1998 <br />decreased by 4,492 fish (39X) from 1997. The number of <br />bluehead sucker collected in the fish trap decreased <br />appreciably in 1998 from the previous two years. The <br />percentage decreased from 42% and 43% in 1996 and 1997, <br />respectively, to 30X in 1998. <br /> <br />6. All fish found in the fish trap were counted and sorted by <br />species. All native fish including rainbow and brown trout <br />were released upstream of Redlands Diversion Dam. All <br />nonnative species plus hybrid suckers found in the trap were <br />removed. <br /> <br />Radiotrackina <br /> <br />1. Four adult Colorado pikeminnow (total lengths: 767, 719. 682. <br />594). captured in the lower Gunnison River downstream of <br />Redlands Diversion Dam, were implanted with LOTEK@ radiotags <br />between 18 May and 22 June 1998. These fish were then <br />translocated and stocked upstream in the Gunnison River. <br />Three fish were released at Whitewater (river mile 14.7) and <br />one at Bridgeport (river mile 29.3). This was conducted to <br />determine 1) the fate of Colorado pikeminnow that had passed <br />through the fish ladder and released upstream of the <br />diversion dam, and 2) if these radiotagged fish would lead us <br />to sites upstream where other pikeminnow may be spawning. <br /> <br />CAp.4B.4 <br />