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Last modified
7/14/2009 5:02:29 PM
Creation date
5/22/2009 5:25:45 PM
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UCREFRP
UCREFRP Catalog Number
7056
Author
Archer, D. L. and H. M. Tyus.
Title
Yampa River Colorado Squawfish Spawning Study.
USFW Year
1984.
USFW - Doc Type
Salt Lake City, Utah.
Copyright Material
NO
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<br />by electrofishing. Since FWS tagged 75 Colorado squawfish in the Yampa <br />River in 1981 and 6 of these were recaptured we could assume a tag <br />return of 8%. Figure 4 indicates the capture recapture locations of <br />Colorado squawfish recaptured by FWS in the Yampa River from 1981-1983. <br />The recaptures support Colorado squawfish data obtained by radiotele- <br />metry in the fall owi ng ways: (1) Fi sh taggedi n the Green Ri ver have <br />been recaptured on spawning grounds in the Yampa River, (2) Fish tagged <br />in the Yampa River spawning grounds have been recaptured in the Green <br />River, (3) Fish tagged on the spawning grounds have been recaptured one <br />and two years later in the same area, (4) Yampa River fish tagged in the <br />upper Yampa have been recaptured on the spawning grounds in the lower <br />Yampa River and (5) Fish tagged on the Yampa River spawning grounds have <br />been recaptured in the upper Yampa River (Figure 4). In addition, the <br />1982 recapture of a. Colorado squawfish on the Yampa spawning grounds <br />that was tagged in the White River in 1981 (Wick et al. 1983) supports <br />the conclusion that Colorado squawfish move from the White River to the <br />Yampa River spawning grounds. <br /> <br />In 1983, netting was conducted in the Yampa River at the two suspected <br />spawning sites (Figures 5 and 6, where IIspawning-type" behavior was <br />exhibited by radiotagged fish in 1981 (Miller et al. 1982) to verify <br />spawning and evaluate movement of fish. A total of 20 ripe or spent <br />Colorado squawfish were captured in 1983, 13 at RK 29 (RM 18) and seven <br />at RK 27 (RM15) in the Yampa River. Included in these collections were <br />four recaptures, one originally tagged with a dangler tag in the Green <br />River, and three tagged in the upper Yampa River. One of the Yampa <br />recaptures was a fish radiotagged by NPS/CDOW personnel in 1982 Wick et <br />al. 1983). Collections in the lower Yampa Canyon in 1981 and 1983 have <br />produced nine recaptures (Table 4) of tagged Colorado squawfish and one <br />return of a radiotagged fish. Included in this is the r~turn of a <br />Colorado squawfish to the same spawning grounds from 1982-83, and two <br />fish tagged on the spawning grounds in 1981 that returned there in 1983. <br /> <br />Discussion <br /> <br />Two major spawning migrations have been identified in the Green <br />River Basin by tracking radio-implanted Colorado squawfish. One migration <br />to the lower Yampa River, identified in 1981 (Tyus et al. 1981) was <br />reconfirmed in 1982 (Wick et al. 1983) and, by this study again in 1983. <br />The Colorado squawfish migrated downstream in the Yampa River and upstream <br />from the Green River to spawn in riffle/pool habitat of the lower Yampa <br />River Canyon each year. Another migration to a spawning site in Gray <br />Canyon of the Green River, suspected in 1981 was confirmed when fish <br />were monitored in 1982 and 1983 (Tyus 1983). These two sites apparently <br />support most of the reproduction in the Green River Basin and Colorado <br /> <br />12 <br />
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