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Last modified
7/14/2009 5:02:37 PM
Creation date
5/20/2009 3:06:21 PM
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UCREFRP
UCREFRP Catalog Number
9690
Author
Recovery Implementation Program
Title
Recovery Implementation Program For Endangered Fish Species In The Upper Colorado River Basin 23rd Annual Recovery Program Researchers Meeting
USFW Year
2002
USFW - Doc Type
21
Copyright Material
NO
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<br />10 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Martinez, A. M. <br /> <br />Colorado Division of Wildlife, Grand Junction, CO <br /> <br />Nonnative Fish Control in Colorado 1998 - 2001. The purpose of nonnative fish removal and <br />control in Colorado and Gunnison River floodplain ponds is to reduce the number of chronic <br />sources contributing nonnative fishes into riverine habitats. Of 744 ponds located within the 100 <br />year floodplain or having direct connection to the Colorado or Gunnison rivers 290 ponds were <br />sampled to determine their fish species composition and nonnative fish control measures were <br />applied in 82 ponds from 1998 through 2001. Of the 20 fish species sampled, totaling 11,600 fish, <br />only three species were native. Nonnative non-sport and nonnative sport fish comprised 80% and <br />17% of the total number of fish sampled, respectively. Green sunfish (30%) was the most <br />common fish species sampled followed by fathead minnow (13.3%) and black bullhead (13.2%). <br />Native fish, including flannelmouth sucker (1.6%), roundtail chub (1.0%), and bluehead sucker <br />(0.4%), comprised only 3% of the total number offish sampled. No threatened or endangered fish <br />were collected. Treatments to control nonnative fish were applied in 75 ponds. Of these 75 ponds <br />54 were sampled one to four years following treatment. Followup inspection and fish sampling <br />showed that 31 (57%) of these 54 ponds had reinvaded with nonnative fish, six (11 %) were dry, <br />and 17 (32%) had not re-invaded by the date sampled. Of the 31 ponds that reinvaded, 24 <br />received water via irrigation, while ten of 17 ponds that did not re-invade received water via <br />irrigation. The remaining seven ponds that did not re-invade received water from seepage and/or <br />springs. Additional effort to control invasion or escapement by nonnative fish was attempted by <br />the installation of 11 screens that functionally treated 27 ponds. Enforcement of fish stocking <br />regulations is another method of controlling nonnative fish. On January 14, 1999 the Colorado <br />Wildlife Commission enacted a nonnative fish stocking regulation for the Colorado River Basin of <br />Colorado, excluding the San Juan drainage. It was revised January 11,2001. A survey was sent in <br />2001 to 50 District Wildlife Managers (DWM's) on the western slope, excluding the San Juan <br />drainage, to identify the level of enforcement ofthis regulation. Of 50 surveys sent 29 DWM's <br />responded. Ten (34%) of the 29 responses discussed the new regulation with landowners. Two <br />(7%) of the 29 DWM's wrote four citations and one warning for violations of this regulation <br />since its inception. Two (7%) ofthe 29 DWM's checked five fish trucks prior to stocking fish in <br />the last three years. Nine (31%) of the 29 DWM's checked 23 outlet screens and four berms. One <br />officer noted that an outlet screen was not in place when inspected. <br /> <br />Martin, L. M. <br /> <br />Colorado Division of Wildlife, GrandJunction, CO <br /> <br />Colorado's Fish Stocking Program for Private Landowners: Process and Results of the <br />2000 and 2001 Stocking Seasons. The Colorado Division of Wildlife (CDOW) administers a fish <br />stocking program for private landowners who desire to stock fish in waters of Colorado. <br />Landowners may legally stock fish by either obtaining a private landowner fish stocking permit, or <br />a commercial or private lake license. The statewide aquaculture stocking permit may apply in <br />certain situations, so landowners may not need to obtain a private landowner fish stocking permit. <br />Specific restrictions apply in order to stock grass carp, and nonsalmonids into waters ofthe Upper <br />Colorado River Basin (UCRB). Berms and/or pond inlet and outlet screens may be required to <br />stock grass carp and other nonnative, nonsalmonid species in locations below 6500 feet elevation, <br />
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