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~;';~~";""Ji; .,..JIJ;"".iOi<.i.,"\i~~~~~3~~ji~;;&~~~.;,.i;:"";';;;<(i'd;";".,fJ.wJ.,;,w.'i;j"',,cl()ji.liLt1;.;pj.J!:.,~"""";';"""i,;.,j,,.,~';::iw'~;;;"'iQ",:. Basin and in ler Colorado Snake river l the middle 1(1951: 82) . Wiesel and :rn Montana. lerged plants riot defend a ir off as do , debris, or if sh. The eggs their second ther aquatic ved that this :d this shiner found that in e lake during ore to forage liners in Paul :cts, foraging " trout. The iners and the '~b,'f:"~fO';V~.",.."~ Crossman (I959) studied the predator-prey relationship between the redside shiner and Kamloops rainbow in Paul Lake, B.C. after the shiners had become common in the lake following accidental introduction. This relationship was influenced by the seasonal movements of the two species. Shiners made up a negligible part of the diet of the rainbow trout during the winter, but comprised over 90 percent of the trout diet in August when the shiners concentrated in the shoal areas and were followed there by the trout. These studies illustrate the need for a thorough knowledge of the behavior and life histories of organisms that are to be introduced deliberately as forage species. The redside shiner is widely used as a bait minnow in Jackson Hole and Star Valley. It is hardy, of suitable size for bait and easily captured and handled. As a bait and forage species, it is one of the most important non-game fishes in Wyoming. The subspecies hydrophlox is generally considered distinct from the subspecies R. balteatull balteatus which occurs in the lower Columbia River system. Colorado squawfish Ptychocheilus lucius Girard Ptychocheilus lucius. Simon, 1951: 80 (Green River at Green River city). /' Body very elongate; head long and flat; mouth very large, the gape extending to near the posterior margin of the eye; fins large, the caudal fin deeply forked; lateral line scales 80-95; dorsal fm rays 9; anal rays 9; pharyngeal teeth 2,5-4,2. Color olive green above, the lower sides yellowish and the abdomen white; the young have a dark wedge-shaped spot at the base of the caudal fin. Distinguished from the round tail and bony tail by the larger mouth and longer head. Weight said to reach 80 pounds in the lower Colorado River; the largest American minnow. Ptychocheilus: folded lip; luciull: pike. The Colorado squaw fish is found only in the Colorado River and its large tributaries. In Wyoming it occurred in the Green River between the city of Green River and the Utah state line before chemical treatment of the Green River prior to the constuction of the Flaming Gorge Reservoir. The rather specialized habitat of this large carnivorous minnow is the silty, canyon waters of the lower Green River and the Colorado River. The Colorado squawfish is probably extinct in Wyoming today because there is no longer any habitat suitable for this torrential-river speCies in the state. With 73 ~ ,-~: :.'. III t: I.: . . :': . " .. :. .. I.. (, E: . I; ~ -:. . .." ~ ... c:' : '!""