The present invention relates to an iris recognition system for fish, which registers information on fish's iris in a server through the recognition of the fish's iris, and identifies an owner of fish through a matching process of a corresponding server or increases convenience of identification of fish. According to the present invention, an inherent identifier for either proof of ownership of a specific fish or pursuit of a fish to be researched can be easily registered as a fish's iris without suffering an injury to fish through recognition of fish's iris. In addition, by virtue of the registration of the inherent identifier as the fish's iris, the convenience in either proof of the ownership of the specific fish caught by fishermen or pursuit of the to-be-researched fish can be significantly improved while preventing mortality of fish, which is caused by an injury of fish.
