PURPOSE: A water purification system for marine fish farm is provided to recirculate seawater by treating with ozone, whereby preventing coastal area pollution such as red tide. CONSTITUTION: The water purification system for marine fish farm comprises a sedimentation tank(20) for primary filtering suspended solids and contaminants discharged from a breeding tank(10); a first ozone contactor(30) for sterilizing various pathogenic bacteria by ozone generated in an ozone generator(60) and for oxidizing ammonia; and a final clarifier(50) for recycling purified water to the breeding tank. Further, the system comprises an oxidant sensor(S1) installed on a drainage line(L3) for measuring the level of oxidant residues contained in effluent and accordingly keeping ozone level optimally; a second ozone contactor(40); and activated carbon filter(F) for removing oxidant residues contained in effluent.
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