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1975, consisting of 18 samples (16 Green <br />River, 2 Bear River) with a total of 177 <br />specimens. The interpretation of data from <br />these samples is somewhat similar to the <br />evaluation of the samples treated in Report I. <br />47. Behnke, R. J. 1976. Identification of a <br />collection of cutthroat trout from Trapper's <br />Creek, Parachute Creek drainage, Garfield <br />County, Colorado. Paper for U. S. Bureau <br />of Land Management, Denver. 5 pp. <br />Trapper's Creek specimens exhibit the typical <br />appearance (spotting pattern, general morphology) <br />and possess the typical character values of S. <br />c. pleuriticus. The absence of basibranchial <br />teeth in 10% of a sample is not sufficient <br />grounds to declare a hybrid influence as long <br />as there is no indication of a hybrid influence <br />in other characters. <br />48. Behnke, R. J. 1976. Problems of coexistence <br />between energy development and the native <br />fish fauna of the upper Colorado River <br />basin with a special reference to endangered <br />and threatened species. Paper, Symposium, <br />Resources for the future. Albuquerque, <br />New Mexico. 4 pp. <br />The construction of mainstream dams, which <br />formed large lakes, regulated flow regimes, <br />precipitated on the silt load and released <br />cold, clear water, created new environments for <br />which the native mainstream fishes were ill <br />adapted. The four mainstream specialized <br />species: squawfish, humpback chub, bonytail <br />chub, and razorback sucker have suffered <br />catastrophic declines from their former abundance. <br />The razorback sucker has maintained limited <br />populations sporadically throughout its former <br />range, but the squawfish, bonytail, and humpback <br />chubs are on the verge of extinction. The <br />native cutthroat trout of the upper basin <br />should be considered as threatened; it is <br />virtually extinct as pure populations. The <br />mayor factor in the decline of native cutthroat <br />trout has been the introduction of non-native <br />trouts which have replaced or hybridized with <br />the native subspecies. <br />ENDANG. FISH <br />DESCRIPTION <br />PHYSIOLOGY <br />SURVEY <br />WHITE R. <br />5 <br />DEVELOPMENT <br />ENDANG. FISH <br />HABITAT ALT. <br />IMPOUNDMENTS <br />1, 2, 3, 4, 5 <br />29 <br />