Laserfiche WebLink
<br />. <br /> <br />CONCLUSIONS <br /> <br />. <br /> <br />. <br /> <br />We present one conclusion for each of our study goals and a few additional conclusions <br /> <br />meant to help in making recommendations. <br /> <br />· Capture and remove (lethal) adult northern pike from reaches of the middle Green River. <br /> <br />Over the course of the six years, we removed a total of 414 northern pike captured from <br /> <br />this reach of river. Associated catch rates were 0.60 fish/hour electrofishing, 0.16 <br /> <br /> <br />fish/fyke-net night fyke-netting, and 0.76 fish/hour trammel netting. <br /> <br /> <br />· Reduce the abundance of adult northern pike in the middle Green River. After 2003, this <br /> <br /> <br />objective was changed to "Maintain low occurrence of adult northern pike in the middle <br /> <br /> <br />Green River." In 2001, crews removed 251 northern pike; this number was reduced to 42 <br /> <br /> <br />the following year, and remained around 20 individuals through 2006. Catch-per-unit- <br /> <br /> <br />effort (CPUE) was also highest for all gear types in 2001 and although CPUE for <br /> <br /> <br />electrofishing and fyke-netting varied over the course of the study period, the overall <br /> <br /> <br />trend in all gear types was a decrease in catch rates between 2001 and 2006. <br /> <br /> <br />· Determine the efficacy of removal efforts. Electrofishing catch rates in the middle Green <br /> <br />are consistently lower than those observed in the Yampa River. Catch rates in 2001 were <br /> <br />comparable to those in the middle Yampa River in 2004; however, subsequent catch rates <br /> <br />have decreased more in the Green River than in the Yampa River and did so immediately <br /> <br />after the initial effort in 2001, pointing to a thus far effective removal effort. <br /> <br />· Identify the means and levels of northern pike control necessary to minimize the threat of <br /> <br />predation/competition on endangered and other native fishes. If one concludes that the <br /> <br />northern pike in the middle Green River are coming predominantly from the Yampa <br /> <br />River, only a minimal (i.e., preventative) amount of effort is required to minimize the <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />29 <br />