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<br />in the Colorado with approximately 40% of the tagged fish being located <br />during the spawning period. Nearly all (80%) fish radiotagged in the <br />Green and Yampa River systems have shown movement in excess of 20 RM <br />prior to the spawning season but only 33% migrated in excess of 20 RM <br />prior to the spawning period in the Colorado and only one fish has been <br />observed migrating extensive distances similar to that so frequently <br />o bserved in the Green River. There has been only one observed migration <br />between the Green and Colorado system and that was one fish which <br />migrated from 176 RK (109 RM) on the Green down into Cataract Canyon of <br />the Colorado River in 1983. A number of fish have been radiotelemetered <br />in the upper Yampa and migrated from as far upstream as RK 172 (RM lO7) <br />(Wick et a1. 1982) to the Yampa spawning area and from the Green River <br />as far as 163 RK (lOl RM) downstream up to the Yampa spawning area. Two <br />radiotagged Colorado squawfish have been tracked up to 215 RK (133 RM) <br />from the White River to the Yampa spawning area and two others to the <br />Gray Canyon site by UDWR and USFWS fisheries teams. Other Colorado <br />squawfish have migrated in and out of the White, Duchesne, Green and <br />Yampa Rivers, signifying substantial comingling of Colorado squawfish <br />stocks within the Green River system. <br /> <br />Spawning Areas <br /> <br />Through radiotracking, collection of gravid adults and larval fishes, <br />much information has been developed on spawning areas and periods. Two <br />reaches, one on the Green River and the other on the Yampa, have been <br />well defined through several years of consoistantly similar observations. <br />There are, however, a number of areas for which less definitive da ta <br />strongly suggest that spawning is occurring. Haynes (personal CCIdlmuni- <br />cation) has demonstrated through the capture of larval Colorado squawfish <br />that spawning occurs at least 33 RK (21 RM) up the Yampa River (Figure <br />3). Radiotelemetry has shown the lower limit to be approximately RK 6.5 <br />(RM 4). Since 1981, 29 radio tagged Colorado squawf1sh have migrated to <br />this reach of the Yampa River during the spawning season, also 12 <br />Colorado squawfish tagged with Carlin tags in other locations have been <br />recaptured in this reach during spawning seasons and two have been <br />captured in the reach during two different years. Four Colorado squawfish <br /> <br />13 <br />