The present invention relates to a fish breeding apparatus convenient for maintenance. The fish breeding apparatus of the present invention has a recycling inlet and a recycling outlet. The recycling outlet is formed at an outlet forming protrusion and includes: a plurality of cages formed therein with a fish breeding space to place and breed fish at a place where water introduced into the recycling inlet passes; a cage mount frame mounted therein with the cages; a circulation pump for circulating water, which is discharged to the recycling outlet of the cage, to the recycling inlet; and a position setting recycling pipe configured to have a plurality of outlet insertion holes inserted therein with the outlet forming protrusion of the cage mounted in the cage mount frame, form intervals between the cage when inserting the outlet forming protrusion into the outlet insertion hole, have a flow passage formed in the shape of a tube entirely closed at an upper part thereof for enabling the water discharged to the recycling outlet to flow toward the recycling inlet for circulation, and having an insertion hole connecting part opened at a portion of an upper part of the flow passage while connecting one recycling outlet to another recycling outlet so as to easily clean the flow passage. The fish breeding apparatus of the present inventionof the present invention can systematically breed and manage experimental fish in a massive and healthy state and easily set the intervals between the cages, thereby preventing a movement of the cage, so that a maintenance is convenient.
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