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9432 (2)
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Last modified
7/14/2009 5:02:35 PM
Creation date
5/20/2009 10:09:36 AM
Metadata
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UCREFRP
UCREFRP Catalog Number
9432
Author
Modde, T. and M. Fuller.
Title
Feasibility of Channel Catfish Reduction in the Lower Yampa River.
USFW Year
2002.
USFW - Doc Type
Vernal.
Copyright Material
NO
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large female that was captured in 1997 appeared to be spent. This was the same <br />location that six radio-tagged adult pikeminnow congregated in late-July and <br />early-August 1993 and where three of these same six pikeminnow congregated during <br />the same time in 1994 (Burdick 1995). The convergence of these radio-tagged <br />pikeminnow in two consecutive years was believed to be during the spawning <br />period. One pikeminnow was captured in late-July 1999 and again in early-August <br />2000 in the same pool at RM 32.7. The pikeminnow captured in July 1999 was <br />originally captured in the Gunnison River at the mouth of Kannah Creek (RM 18.2) <br />6 years earlier on 3 May 1993. The pikeminnow captured in August 2000 was <br />originally captured in April 1993 only 0.1 mile upstream. In 1993, this fish was <br />implanted with a radiotag and was one of six fish that converged to RM 32.7 in <br />early-August 1993. One other pikeminnow was captured at RM 33.7 in early-August <br />2000. This fish, at capture, was tuberculate on the body, fins, and head, and <br />was expressing milt. This pikeminnow was captured only 100 m upstream in a large <br />eddy in mid-July 1993 and was tuberculate and expressing milt during that time, <br />also (Burdick 1995). The capture and sightings of pikeminnow during 1997, 1998, <br />1999, and 2000 between RM 30 and 35 provides additional documentation that this <br />river reach continues to be occupied by Colorado pikeminnow, and appears to be an <br />important spawning area for this species in the Gunnison River. Moreover, the <br />capture and sightings of tuberculate pikeminnow suggest that they are still <br />probably using the same river reach for spawning as they did 5 to 6 years <br />earlier. <br />In early-August 2000, a pikeminnow was captured at RM 20.4, just upstream <br />of Whitewater. This fish had previously been captured at RM 2.9 in the Lower <br />Gunnison River downstream of the Redlands Diversion Dam on 7 May 1993 and <br />implanted with a radiotag. It was later translocated upstream and stocked at RM <br />42.7. This pikeminnow converged to RM 32.7 in 1993 with five other radio-tagged <br />pikeminnow and again in 1994 with two other radio-tagged pikeminnow during the <br />suspected spawning period (Burdick 1995). The significance of this recapture is <br />that pikeminnow captured downstream of the Redlands Dam have remained for several <br />years upstream after being translocated. <br />So, from data obtained for this and past studies, several different <br />movement chronologies can be described for Colorado pikeminnow using and <br />occupying the Gunnison River. First, prior to the fish passageway being <br />constructed, some fish captured downstream from Redlands Dam that had been <br />radiotagged, and translocated upstream of the dam have returned downstream over <br />this dam and survived, whereas others have remained upstream of the dam for over <br />7 years. Second, fish captured upstream of the diversion dam that were <br />determined to be residents of the Gunnison River have been recaptured 6 to 7 <br />years later very near the location of their original capture. These included <br />both fish that had been radiotagged and those that had not. Following <br />37
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