Abstract: The invention relates to the use of bronopol (bromo-2-nitropropane-1,3-diol), in the treatment of various diseases of aquatic organisms, particularly salmonid fish and their eggs. The diseases which can be treated include thgose caused by fungal infections (such as Saprolegnia parasitica); protozoan infections, whether flagellate (such as Ichthyobodo necatrix) or ciliate (such as Icthyophthirius multifiliis); bacteria (such as Flavobacterium branchiophilum); and myxobacteria (such as Cytophaga psychrophila). Also disclosed is a method of disinfecting fish tanks and/or equipment, using a solution of bronopol.

Abstract: The use of various pyrethroid compounds is disclosed for the treatment of the immature phases of sea lice in sea water fish, such as salmon, and for the prophylaxis of adult sea lice infestation in such fish. Cypermethrin, high-cis-cypermethrin, lambda-cyhalothrin and deltamethrin are shown to be most effective.