The roller grader is designed for sorting whole, gutted, or headed fish. It is built on a conveyor system, with sorting units consisting of adjustable frames, electric actuators, and rollers.

The rollers are suspended beneath adjustable frames, and their height determines the size of the fish sorted into each bin/tub. The speed of the conveyor belt and the height and speed of the rollers can be controlled.

The roller grader is computer-controlled and programmed to handle different fish species, allowing for precise and efficient sorting.