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Table 1- Summary of sample design for small mouth bass removal using boat electrofishing at Little Yampa Canyon (L YC) and Lily Park (LP) study sites in the middle Yampa River, Colorado, 2003-2007. 2003 2004 2005 2006 2007 Dates Sampled 12 Apr - 2 Jul 21 Apr - 8 22Apr-21 20 Apr - 4 17 Apr - 30 Jul Jul Jul Jun Site Lenath L YC Control 6 miles 12 miles 12 miles L YC Treatment 6 miles 12 miles 12 miles 24 miles 24 miles LP 5 miles 5 miles 5 miles 5 miles Location (river mile) L YC Control 105.2-111.2 112-124 112-124 L YC Treatment 111 .2-117.2 100-112 100-112 100-124 100-124 LP 50.3-55.3 50.3-55.3 50.3-55.3 50.3-55.3 # mark / # removal occasions L YC Control 5/0 5/0 4/0 L YC Treatment 3/2 1 /8 1 /8 2/5 1/7 LP 1 /5 1 /5 2/4 1 /5 Effort (hours) L YC mark & release 55 73 84 59 25 L YC removal 12 105 116 136 156 Total 70 178 200 195 181 LP mark & release 3 5 10 5 LP removal 24 30 26 30 Total 27 35 36 35 Lenath of bass (mm) Tagged on mark pass 100 150 150 150 150 Translocated all sizes all sizes ;::.250 ;::.250 ;::.250 Euthanized 1 none none <250 <250 <250 Translocation site Elkhead Elkhead Elkhead Justice Justice Reservoir Reservoir Reservoir Center pond, Center pond, Elkhead Res Elkhead Res Significant Information Primary Removal Elkhead Elkhead Second year purpose was begins; sites Reservoir Reservoir of removal to determine expand to dam dam from entire bass density 12-miles; Lily construction construction study sites. and catch Park added begins, start active with rates, partial as study site; lethal unscreened removal on began 1-mile removal of releases, last 2 passes community small bass bass sampling. <250 mm escapees TL; start documented low-flow young bass removal. 1 From 2005 to 2007 bass <150 mm captured on the marking pass were euthanized and those ;::.150 mm were tagged; on subsequent removal passes each year bass <250 mm were euthanized. 31