Laserfiche WebLink
<br />SENJ' BY: <br /> <br />12-13-SS';10:07AN <br /> <br />lITAH WILDLIFE RES." <br /> <br />303-236-0027:# 3. 'A <br /> <br />VIII. AccQ.plL.b"eu~5/Iuitial Pi~diugs and Shortcomings, <br /> <br />~~8k 1)\ Literature review initiated on mcet non-native flsh. <br /> <br />Tuk 2). <br /> <br />KETBOOS - Forty-nine nortbern pike were captured t~i. 8prin9 using <br />el..atrcfiahinq and a.iolo9 90a". All rike ..~u~e ..ea.urad &Jl(!. wel.9hed. 'tw..nty- <br />nine of thee. fieh wore surgioally imp a~ted with radio tranamitters (A'tSI 1- <br />ye.r durationl wl~h external aotannaa sn4 releaaed at tbe point of capture. <br />The """,.ininq fieh Itel:e taqged witb flay tag" and "..i.......d. At l.....t onoo <br />monthly, we monitored the larqe-scale movementa of all radio taqqed fiah by <br />floating from 6pllt Hountain down to sand Waeh with a non-direccional antann~ <br />snd ATS receiver ecanning frequanciee at 1 par 10 aeoonda. During each <br />eamplinq pe"iod, individual movement patterne ware quantified over a 24-hour <br />porled (or at leaat five flsh. Water temperatura. and flows at the exact <br />location ot the tish' were also recorded. Thes8 data W$re used to calculate <br />the energy expendad by an,average northern pLke ln the Green River and ueed to <br />lIxt1.metll tl,. """,unt of food intak.. required to """ob obse"v..d growth. <br /> <br />REBUT,,!,:! - To date, our datil Buqqellt that northern plica congr..gace ln the <br />lIprlng (following peak spring flows) in t~ Jonsen area and in particular <br />around Ashley Creek. Of the 49 fish initially oaptured, 38 came from this <br />vioinity. onoe fLah were released, they moved in both up- and ~own-8tream <br />direotions with ona fish reachLng the confluence at the Tampa 42 daya aftar <br />release and another raachLng Sand Wash withLn 53 day. of reloa88. While thase <br />diatllncee are substantial, the enllrqy raquirv4 for movLng at ths observed rate <br />La minimal, Daily movement patterne aleo suggeet a low anergy 8trBtesY with <br />moet fiah being observed in protllcted side callnnela or oontiguoue with aand <br />bare with low velocities during the daylight hours and in deep, proteoted <br />areaa with little or no flow durinq houre of 4arkness. oooasio~al ~ovDmont <br />opurts wara ohQarvsd, but generally occurred ~n dowaetre.. direotions <br />suggesting an energy min1.mizatio~ strategy of pray oapture. In e~~y, our <br />re8ulta Buggaet that little energy ia aotualLy expanded by these fiah and <br />daLly pray ration I of 1-4 fish per day are more than &dequatll for energy <br />required to aooount for obllerved growth rates. <br /> <br />M~N~G~~NT IMPLICATIONS - While o~r data ao not sugq..t that pike are any more <br />or a threat to native fish during eu~r months than any of the atnar myriad <br />exotio predatore, we nevorthsl..s maintain that an a=tive proqr&m of pi~e <br />rarooval should be pursued by management aqanoies. TIlLa ill especially likely <br />to rllsult in oboervable impacts on the pike POPUlation given their propsneity <br />for congregating in pradiotable areas during the spring. A one to two week <br />lntanaive harvastlng of fien frOM tne Aehley Creek araa will likely decrease <br />ths 'Ouray' pika p"pulBtio" by 11IO.& tlllUl 50'. <br /> <br />Taak 3). <br /> <br />Over 7000 published articles hav" basn identified for the non- <br />na~ive fiah in the drainage. Th... article aro being reviewed to <br />idantify potential eelective aontrol options. In addition Over <br />200 articlss on selectLve removal And control teohniques are being <br />reviewed. <br /> <br />IX. status of Data SubmlsaioD' <br />On tract <br /> <br />IX. 1~ 92 Budget <br />a. Funds provided: $57,000 <br />b. FUDas expou4Qd, $37,000 <br /> <br />c. D~ftarence' $ 20,000 <br />d. Explanatiod' for any major dl.~repanay betw..en <br />Half of the UO~ fiscal year Bti1l remains as do <br />manaqemQn~ lunda. Budget O~ crack. <br /> <br />IXa. And IXb., <br />half UDWa pro~ram <br />