The use of chloramines in disinfection by public water systems is known to be fatal to fish. The residuals can damage the gill tissues, enter the red blood cells, and cause an acute blood disorder. Chloramine residuals should be removed from the water prior to contacting any fish. As such, fish hobbyists should be notified by the public water system, along with pet stores and aquarium supply establishments. (Alternative Disinfectant and Oxidants Guidance Manual, EPA815-R-99-014, April 1999).