The present invention provides a system for bath treatment of fish afflictedby exteriorinfections wherein said system includes at least one first cage for raisingfish, the saidcage being adapted to retain fish in a body of water. The improvement of thepresentinvention wherein said system comprises at least one non-porous treatment bathcagefor placement in an aqueous medium adapted to receive infected fish from saidat leastone first cage for treatment of said infected fish contained within said atleast one saidfirst cage, the said at least one treatment bath cage having a closed loopwaterrecirculating and filtration system adapted to maintain water quality andremove solidsduring treatment of said fish.
