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<br />AIDES TO LAKE REHABILITATION: AERIAL ROTENONE <br />APPLICATION AND A SIMPLIFIED DETOXIFICATION <br />PROCEDURE <br /> <br />LLOYD K. HAZZARD <br /> <br />SENIOR WILDLIFE BIOLOGIST <br />COLORADO DIVISION OF WILDLIFE <br /> <br />A successful attempt was made to eliminate rough fish from part of <br /> <br />a Colorado drainage that contained seven lakes, numerous bogs and <br /> <br />fifteen miles of tributaries, The use of a modified fish tank in a <br /> <br />Cessna 185 reduced the work effort on the ground and contributed to <br />the success of the project. In addition, the use of a 500-gallon <br />fish tank with a simplified constant flow mechanism prevented fish <br />loss below the desired natural barrier using KMn04 to detoxify the <br />rotenone. Both the aerial rotenone application and the detoxifica- <br /> <br />tionprocess were of great benefit in helping achieve a management <br /> <br />target that can benefit the manager and the user of the resource. <br /> <br />With an increasing number of fishermen and a relatively fixed surface acreage <br /> <br />of water available for trout production, conservation agencies have to do the <br /> <br />best possible job with what they have available to manage. In some cases, <br />the result might be a catch and release program or variation of bag limits <br />designed to reduce the harvest but increase the availability of fish in the <br /> <br />habitat. Another approach is to make certain that maximum production is <br />achieved in waters that are already available. Maximum trout production can <br />only be achieved in some waters by removing rough fish species, especially <br />when the competitor is the prolific western white sucker (Catostomus commer- <br />soni). <br /> <br />/ <br />