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will be added to the system by attachin9 a 3-inch gate valve to the top of an airtight lid. The tank operator then merely opens the sliding push-pull gate valve lever on top of the lid prior to opening the release valve. Two previous attempts had been made to remove fish from this drainage without success. No suckers were found at the conclusion of the operation. The aerial work was considered essential on this project in conjuction with very thorough ground effort. Photographs of the following detoxification tank release mechanism will be pro- vided to any interested persons on request. ~ The detoxification mechanism consists of a 500 gallon fiberglass fish trans- port tank mounted on a two axle, four wheel, converted army surplus 3/4 ton trailer. The tank is connected to a stock tank float valve by a one inch flexi- ble hose. The float valve is fitted with necessary pipe fittings, mounted to a base, then placed in a five gallon bucket that releases water to the stream tht'ough a 19/64th inch hole drilled in a pipe cap attached to a piece of pipe that is approximately eight inches long and is brazed to the container. A valve that opens SUfficiently to permit a flow of one gallon per minute could be substituted that could add a greater range of flexibility in flow rate se- lection. An idealistic detoxification process would release the proper amount of KMn04 at a known rate into a known amount of water containing a known amount of rotenone. Since all of the variables are not really known, some estimates have to be made. The float valve provides a constant release regardless of the head of water in 5