OBSERVATIONS ON THE EFFICACY OF CHLORAMINE-T TREATMENT TO CONTROL MORTALITY IN A VARIETY OF SALMONIDS

Results and observations from 120 chloramine-T treatment trials to con trol mortality in a variety of salmonids caused by bacterial gill dise ase and columnaris are provided to aid fish culturists in determining more effective treatment regimes. When chloramine-T was used at 6, 10, or 15 mg/L, regardless of treatment frequency, efficacy in control of mortality was observed in 56%, 65%, and 61% of the trials, respective ly. When chloramine-T was administered one, two, or three times, regar dless of treatment concentration, efficacy was observed in 38%, 62%, a nd 88% of the trials, respectively.