To provide a fish sorting apparatus for correctly sorting many species of fish with high efficiency.

This fish sorting apparatus comprises a plurality of lines of belt conveyors 1 which have surfaces of different fish slidability and are arranged adjacently in parallel to each other with a downward slope from a conveyor of the highest slidability 1 to the lowest slidability, so that fish are supplied to a conveyor of the highest slidability, laterally slide from a conveyor of higher slidability to an adjacent conveyor of lower slidability on the way of conveyance, thus are assorted by species of fish, and are discharged through each conveyor 1.