Technical Report

 

State-wide fishery rehabilitation, Malheur Reservoir and tributaries segment Public Deposited

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https://ir.library.oregonstate.edu/concern/technical_reports/6q182m18c

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  • Malheur Reservoir in Malheur County, Oregon, was chemically treated on October 11, 1962, to eliminate an abundant population of black crappie and a smaller population of finescale suckers and redsided shiners. A total of 1,100 gallons of liquid synergized rotenone (Pro-Noxfish) was used to establish a toxicity of 1.5 p.p.m. in the reservoir. The visible kill consisted of black crappie (99.4 per cent), rainbow trout (0.5 per cent) and finescale suckers and redsided shiners (0.1 per cent). Carp which reappeared following the 1950 eradication program appeared to have been completely eliminated from the reservoir and tributaries in the 1955 treatment. Toxicity of the rotenone in the reservoir appeared to be short-lived, possibly because of the high total dissolved solids in the water. Five days after the initial treatment, chemical tests for rotenone in water samples indicated less than 0.5 p.p.m. Chemical treatment of approximately 20 miles of tributary stream was completed September 10, 1962. A total of 200 gallons of liquid synergized rotenone was used in drip stations to maintain a toxicity of 2.3 p.p.m. in the live stream. Potholes in the lower eight miles were treated with a portable 200-gallon high pressure spray tank. The kill of finescale suckers, redsided shiners and dace numbered in the thousands. Several thousand trout were killed in the stream above Ironside. The stream and the reservoir will be restocked in the spring of 1963.
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