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<br />C? <br />) <br />~~) <br />~ <br />~ <br />~ <br /> <br />rare fish. Control of stocking or eliminating use of any competing or <br />depredating nonnative species as live bait may be useful, since it would <br />reduce population augmentation, except from the wild. Complete elimination or <br />removal of nonnative species would require a massive effort, although the <br />treatment of selected reaches may be feasible. <br /> <br />Further study on the role of competition and predation between nonnative and <br />rare species is necessary to further identify nonnative species of concern, <br />the extent of the problem, and potential solutions. Results of on-going <br />studies in the Colorado and Green Rivers will be evaluated with regard to <br />their applications on the San Juan River. <br /> <br />3.5.2 Soortfi5hinQ <br /> <br />Many nonnative species have been introduced to create and support sportfishing <br />for both warm and cold water species. Some of these nonnative sport species <br />may also compete with or prey upon rare species. The relationships between <br />these species and the rare fish will be studied, as mentioned in the preceding <br />section. <br /> <br />Though there is minimal overlap between cold water fish species (particularly <br />5almonid5) and rare species habitat, management for sport fish can also <br />displace native fishes. For example, releases of colder water from <br />reservoirs, such as Navajo, have created habitat for cold water sport fishes <br />rather than for native fishes. This may be a factor below major dams or <br />diversion structures, e.g., Flaming Gorge and others. Where feasible, fish <br />passages and warmer water releases have been recommended to offset some <br />impacts of sport fish management in areas where rare fish currently occur. <br /> <br />A less obvious impact of sportfishing on native fishes may be the result of <br />take by angling or seining for bait. Colorado squawfish and humpback chub <br />captures by anglers have been documented since 1979 by the Colorado Division <br />of Wildlife (Colorado) and Utah Division of Wildlife Resources (Utah). The <br />Colorado Division of Wildlife captured 29 Colorado squawfish (1979-ii) by <br />angling. These reported captures may represent only a fraction of the total <br /> <br />26 <br />