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Last modified
7/14/2009 5:02:31 PM
Creation date
5/22/2009 6:43:36 PM
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UCREFRP
UCREFRP Catalog Number
7876
Author
Elmblad, W. R.
Title
The Outcome Of An Experimental Stocking Of Colorado Squawfish In Kenney Reservoir Near Rangely, Colorado - Final Report.
USFW Year
1997.
USFW - Doc Type
\
Copyright Material
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The seining effort was conducted during lower flow periods in <br />summer when the area and depth of backwater habitats would be <br />reduced to improve seining effectiveness. The upper reach was <br />sampled for one day in July 1991 and in July 1992. The lower reach <br />was sampled only in July 1991 over a two day period. Each <br />backwater in the lower reach was sampled onetime by seining as <br />described above except for one large backwater at the very lower <br />end of the reach (RK 121.6) which was sampled on July 12 and 19 by <br />seining and on July 12 by blocking the mouth with a trammel net and <br />electrofishing the inside area. Trammell (1991) reported <br />recovering large numbers of stocked Colorado squawfish from this <br />backwater. By 1992 this backwater had filled with silt and was <br />nonexistent. <br />In the reservoir, electrofishing was conducted along the shoreline <br />for six hours in the afternoons on July 10 and 11, 1991, and for 45 <br />minutes in the afternoon and 45 minutes after dark on June 29, <br />1992. Trammel and gill nets were fished interchangeably around the <br />reservoir periphery. All nets were set near waterline and run <br />perpendicular to the bank toward deeper water. All visible habitat <br />types were identified and sampled. Habitat types included bays, <br />the inlet delta, steep banks, shallow banks, and riprap. In 1991 <br />trammel and gill nets were set on July 10, 11, and 12 for a total <br />effort of 200 hours during daytime and nighttime hours. Trammel <br />and gill nets were set on June 19, 22, 23, and 30, 1992, for a <br />total effort of 250 hours during daytime and nighttime hours. The <br />majority of trammel and gill netting effort occurred during <br />overnight sets. Very little of the reservoir basin was shallow and <br />unobstructed enough to be seined. Therefore the seining effort was <br />limited and will not be reported on further. <br />RESULTS <br />Kennev Reservoir -- 1991 and 1992 SaMina <br />Table A-2 shows the trammel and gill net catch for 1991 and 1992. <br />No Colorado squawfish were captured either year. <br />Table A-2 also compares the trammel/gill net catches of 1991 and <br />1992 with earlier catches in the reservoir by Trammell (1991) using <br />gill nets. This comparison shows data from 1991 for flannelmouth <br />sucker, bluehead sucker, black crappie, and common carp being <br />anomalous to data from the other years. There is no apparent <br />explanation for such a deviation in the catch. Disregarding 1991 <br />data, some trends appear. Roundtail chub are decreasing. Black <br />crappie, black bullhead and common carp are increasing. Colorado <br />squawfish and largemouth bass are no longer present. In more <br />recent sampling (1993-1996), Colorado squawfish and largemouth bass <br />are still not found, bluegill are no longer present, and black <br />crappie and common carp are still very common (author, unpublished <br />data) . <br />6 <br />
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