concentrations up to 500 ,ul 1-l to control fungal infections on all life stages of all fish
species, including eggs. This study demonstrated that with fungal infected eggs (10%
infection), hydrogen peroxide treatments of 500 ~1 l- ’ appeared to be the most effective
for controlling the spread of fungus and improving hatch. This study and previous
preliminary egg efficacy studies (Marking et al., 1994) tested hydrogen peroxide
treatments of 1000 ~1 1-j to evaluate the safety and efficacy of higher concentrations.
However, treatments of 1000 ~1 1-l are not currently permitted in the USA. Additional
toxicological and efficacy studies must be conducted before international acceptance of
higher treatment concentrations will be allowed for various life stages of fish.