Abstract
Abstract Tests with ozone to control infective Ceratomyxa shasta in cutthroat trout (Oncorhynchus clarki, formerly Salmo clarki) successfully established the minimum effective ozone treatment, the product of ozone concentration (mg/L) and minutes of ozone contact with water, of 0.84. Summer steelhead (O. mykiss, formerly S. gairdneri), reared in raw water or ozonated water from August 1985 through March 1986 and released in May 1986, had 81.2 and 1.4% mortality, respectively. The mean lengths of steelhead reared in ozone-treated water were significantly larger than those of control fish. In 1986–1987, summer and winter steelhead and sea-run cutthroat trout were reared in ozonated water from July through mid-November and thereafter in raw water until April. Fish reared in ozone-treated water again had significantly less mortality and were significantly larger than control fish.
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