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<br />, <br />.,V <br />til <br />fF- <br />'f <br />~f <br /> <br />. <br /> <br />'. <br />.. <br /> <br />~ <br /> <br />. <br /> <br />. <br /> <br />ABSTRACT <br /> <br />The San Jua.n River and tributaries upstream from the NawlJO Dam .'ore rotenoned <br /> <br />to eliminate trash fish species within the proposed impoundment area. A total of <br /> <br />" <br />,. <br /> <br />3,870 gallons of rotenone was used for the Navajo, l'ine, and San Juan Rivers. Lethal <br /> <br />.i <br /> <br />concentrations were effective On approximately 70 miles of the San Juan River, 15 <br /> <br />miles of the l'ine River, and six miles of the ~avajo River. <br /> <br />. <br />, <br />~.;,. <br />a, <br /> <br />1 <br />t <br />$ <br />~. <br />,~. <br />....... <br />t!:. <br />jt <br />~i. <br />t <br />...., <br />'f <br />) <br />i <br />f <br />~. <br />~ <br />i. <br /> <br />t <br />f~ <br />.,;~. <br />". <br />.. <br />i\' <br />~I:t. <br />~" <br />~'l <br />f/ <br />\. <br />l. <br />.. <br />';' <br /> <br />Fourteen species of fish. were eliminated with, this operation, The most abundant <br /> <br />species found were the flannelmouth sucker and the bonytdl chub. Channel catfiSh <br /> <br />was the predominant game fish in the San Juan and l'ine Rivers; only four trout were <br /> <br />observed. The game fish found in the Navajo River were predominantly rainbow trout; <br /> <br />a few brown trout were found. <br /> <br />Very good kills were obtained in all three rivers, especially the San Juan, <br /> <br />where lothsl concentra.tions of rotenono carried approximately 40 miles- below the <br /> <br />Navajo Dam. <br />