Laserfiche WebLink
<br />rE~ 2b U2 nON II:be An ~O Kiver Kecovery <br /> <br />~AX NU, jUj~b~(jLI <br /> <br />r. Ub/lU <br /> <br />001422 <br /> <br />B, Lower Colorado River Sasin <br /> <br />grand Ca.!!voll (Little Colorado River ILCR] and Mainstem Colorado River) <br /> <br />rmrent Protocol: Trammel nets in the LCR ill spring and fall, Two sampling occasions arc done <br />aboul 2.,.3 month apart. Currcnt smnpling at thrce trend sites; uppcr, middle, and lower reachcs <br />oftha LCR. Trammel nets, hoop nets, and electrofishing in the mainstem in spring, summcr, lll1l1 <br />fall. Thrcc sampling occasions are donc about 1-2 months apart. Current sampling at the mouth <br />oflhe LCR, Middle Granite Gorge. <br /> <br />Rccommcnc1ation~: <br />Expand sampling in the LCR to include a third sampling occasions [or mOTe <br />precise nlark-recapture cstimate <br />Estimates of adults will include 1ish ~200 mm TL; subadLl1ts will include fish ISO <br />to 199 IUm TL <br />Sampling will cxpand to captllCe subadLllts with hoop nets <br />. Maintain sa111pling in the nlainstcm to include a third sanlpling occasioll <br />Estimate size of aggregations at 30-mile, LCR inllow, Middle Granitc Gorge <br /> <br />TENTATIVE SAMPLlNG SCHEDULES <br /> <br />Tentative sampling schedules for popululion estimates are provided for Colorado <br />pikcmillnow ('rable I) and humpback chub (Table 2). The schedule for a given populatiollllluy <br />be modified if a need is identified for l\n additional estimate bccatlse ofahighly variable estimate <br />caused by unsuitable sampling conditiolls. <br /> <br />5 <br />