On the basis of Pagrosomus major's biology and behavior characteristic, a Pagrosomus major grading equipment fitted for deep sea cage was designed and manufactured.

This paper makes a description of the technological qualities of rice, the technologies of its cleaning, husking, husk-separating, milling and grading, and its handling mode and equipment in USSR.

The term grading means leveling the ground surfaces as needed to permit transit and operation of vehicles and equipment and to permit placement of the pipeline at the desired elevation.