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53 <br />Richardson). The brown trout was probably the most common <br />~- trout. The redside~er and the fathead minnow are both recently <br />~._: <br />~'° introduced exotics which have spread and become very common in <br />-the river. The Utah sucker was found occasionally only in sections <br />I-and III and was not found below station #9 in section III. <br />The carp was present in section I, as far upstream as mile <br />r_ I0 of the treated area. This species apparently migrated up the <br />New Fork River, from the Green River, each year during high <br />water. The adult carp spawned in the sloughs and backwaters of. <br />the New Fork River while those areas were connected with the main- <br />stream. Following the subsidence of the runoff; the adults retreated c.ra <br />_;-. <br />to the main stream-and the warmer, deeper areas down river. The "' <br />-young fry remained in the natural brood ponds until the following ~ ~. <br />_~ <br />year. The upstream spawning migrations allowed the carp to grad- <br />wally extend its range until the excellent trout fishery of the upper <br />New Fork and Green Rivers was threatened. This danger was a pri- <br />J <br />~. <br />mart' reason for the 1962 rotenone treatment of the Green River. <br />Sections III and IV of the Green River had a fish population j <br />somewhat similar to the upper areas. However, because of the <br />warmer, more turbid water, the coarse fish populations dominated <br />the habitat. Whitefish, although common, surrendered their domi- <br />nanc a to flannelmouth sucke r s and de cr ea s ed in numbe r downstream.. Zhe <br />bonytail chub Gila robusta (Girard)] was a common inhabitant of <br />4_ <br />