Laserfiche WebLink
<br />rt8 ~b O~ nUN ll:b~ AM ~U ~iver ~ecovery <br />OOH21 <br /> <br />rAX NU, JUJ~o~(J~( <br /> <br />~, UI/1U <br /> <br />Estimates of adults will inclllde fish ~200 111m TL; subadults will include !ish 150 <br />to 199 mm TL <br />Sampling will expand to captllrc subadults with c1cctrolishing and hoop nets <br />Implement two crews to sample simultaneously at diffcrcnt sites <br />. Use key meristics/morphomctrics to scgreg~lte Gila cyp!w, Gila roblls/a, and Gila <br />sp. <br />Conduct estimates in each of3 consecutive years followed by 2 ycars o/T <br /> <br />Yampa Canvon (Deer '{..odec to Echo Park) <br /> <br />J;::urrent Protocol: Electrofishing in June and early July at >1,000 ers, and angling in <br />hily-August. Population estimates in Yampa Canyon arc imprecise because ofsmal\ numbers of <br />fish that arc widely dispersed through 70 km of river. <br /> <br />RQeol11l11cnLlations: <br />. Use total captures and catch rates to serve as an index ofpopulatioll size and <br />trend, and length-frequency analysis and simulations to assess rccruitmcnt. <br />. Sample once per year, every year, instead of multiple mark-recapture approach <br />. Estimates of adults will include /ish ~200 mrn TL; subaduits will include tish 150 <br />10199 mm TL <br />Sampling will expand to capture subadults with e1cctrotishing aml hoop nets <br />. Use key mcristics/morphomctrics to segregate Gila cypha. Gila rolJl/sta, and Gila <br />sp. <br /> <br />Cataract Capyon (Colorado River Confluence to Lake Powr.lI) <br /> <br />Cun;cnt Protocol: Proposcd protocol for 2002 is tral1llllelllets, clectrolishillg, and hoop nets from <br />mid-September to Octobcr.. Numbers of wild humpback chub in Cataract Canyon are small, and <br />protocol will have to be dctermincd following sampling in 2002. <br /> <br />Recommend a I j on~: <br />. Attempt mark-recaptllrc estimatcs in 2002, and determine if it will be necessary to <br />sample each year for total captures and catch rates to serve as an indcx of <br />pOP\ll<ltlon size and trcnd, and length-frcquency analysis and simulations to assess <br />recruitment (similar to Yampa Canyon) <br />Estimatcs of adults will include fish ~200 mm 'fL; subaduits will include fish 150 <br />to 199 mm TL <br />S,lmpling will include elcctrotishing and hoop nets to capture subadults to asscss <br />recruitment <br />Use key lllcristics/morphomctrics to scgregate Gila cyp/za, Gila roblfs/a, and Gila <br />sp, <br /> <br />. <br /> <br />4 <br />