8098 - Laserfiche WebLink

Home Browse Search

that are known should be compiled in one manual and made available to person- nel involved with lake rehabilitation efforts. This report will address two modifications of techniques that may not be new but have been beneficial to fishery workers in southwestern Colorado. They deal with aerial application of liquid rotenone and an improved detoxifica- tion technique. Photographs of the following described tank-valve-release assembly will be pro- vided to any interested persons on request. Aerial application of liquid rotenone was considered necessary to accomplish a project on South Clear Creek above South Clear Creek Falls in September of 1981 because of the presence of numerous seeps, bogs and mud flats that made approach by ground personnel extremely difficult. A discarded aerial fish transport tank designed for use in a Cessna 185 equipped with a photo well was gutted of interior compartments and a hinged lid was constructed and attached to the top of the tank. The bottom of the 8-inch discharge tube was sealed. A 3~-inch diameter hole was cut in the lower forward facing portion of the discharge tube. A 3-inch plastic gate valve was attached to the dis- charge tube with a release lever that extended into the cabin of the plane when the tank was installed. A 3-inch long section of 3-inch diameter PVC was then attached to the valve. This assembly made up that portion of the equipment and attachments that remains intact and is installed in one piece in the air- craft. The remaining portion of the discharge or spray assembly was made up of a 3- inch pve 900 elbow attached to a3-inch PVC Y, standard length, that was then capped on both ends. Eighteen 7j8th inch holes were randomly drilled into the $