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Tests conducted with a pilot scale ozone system to control the infective stage of the fish Pathogen Ceratomvya shasta found the minimum effective ozone dose to be a CT value (ozone residual x minutes of retention) of 1.23. Mortality of summer steelhead reared to, term on ozonated and raw river water was 1.4% and 81.2% permil; respectively. Test fish were significantly larger at the end of the rearing period. A full production system for the hatchery has been recommended.
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