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<br />rt~ ~b U~ MUN jj:bl AM VU ~iver ~ecovery <br /> <br />l' All NU, jUj~ti~ (j1:' ( <br /> <br />1'. Ub/lU <br /> <br />001420 <br /> <br />Il. Humpback Chub <br /> <br />A. Upper Colorado River Bnsin <br /> <br />Block lil.ll'ks (Mo..9re Bottom) <br /> <br />Currcnt Protocol: Trammclnets rrom mid-September to October. Three or four sampling <br />occasions are donc about 1-2 weeks apart. <br /> <br />.Recom IllCllllat i 0 Q.~: <br />Ensure sampling is conducted throughout occupied rcach <br />. Estimates of adults w11l inchlde fish ;:200 mm TLj subadults will include fish 150 <br />to 199 mm TL <br />Sampling will expand to capture subadults with electrofishing and hoop llctS <br />. Usc key rneristics/morphomelrics to segregate Gila cypha, Gila robusla, and Gila <br />sp. <br />Conduct eslimatcs in each of3 eonsCclltive ycars followed by 2 years oiy <br /> <br />Wcstwnler Canyon (Millcrs Cabin to Bil! Hole) <br /> <br />CUITont Protocol: Trammel nets fro111 mid-Seplember to October. Three sampling Oc.easlolls arc <br />done about 1-2 weeks apart. Current sampling only at three trend sites: Millers Cabin, Cougar <br />Bar, Hades Bar. . <br /> <br />Recommcndations: <br />Expand sampling to include Mincrs Cabin, RM 123,-122, Cougar Bar to Liltle <br />Hole, Ilades Bar, and Big Hole; clectrofish intervening reaches <br />Estimates of adults will include fish ~200 mm II,; subadu1ts will includc fish 150 <br />to 199 mm TL <br />Sampling will expand to capture subadu1ts with electrofishing and hoop nets <br />Use key mcristics/morphometrics to segregate Gila cypha, Gila rohllsliI, and Gila <br />sp, <br />Conduct estimatcs in each of3 consecutive years followed by 2 ycars off <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />/lcsnlation/GI'av Canyons (Sand Wash to Rattlesnake Canvnn) <br /> <br />~11rrent T'rot,QQQ.l: Trammel nets from mid-June to AllgUSt. Three sampling occasions are dono <br />about 1-2 weeks apart. <br /> <br />B-ccol11men~lations: <br />Sample earlicr in June to minimizc effect of dropping water levels on sampling <br />efficiency <br />. .Expand sampling to include 12 sites; electrofish intervening reaches <br /> <br />3 <br />