Abstract: Apparatus for sizing and deheading shrimp is illustrated wherein an open, elongated trough has a pair of sides which diverge laterally outwardly from adjacent one end of the trough toward the other with a conveyor for moving shrimp along the trough permitting progressively larger shrimp to fall through the open bottom of the trough, and a number of conveyors are provided for carrying the shrimp thus sized, into contact with a stationary blade in such a manner that the head is pushed over the blade and body passed under the blade and the heads and bodies collected separately.