The present invention relates to an apparatus for finely cutting a feed used in a shellfish such as an abalone, and more particularly, to an apparatus for cutting a feed used in a shellfish such as sea mustard or kelp, The present invention relates to a feed separator for shellfish culturing which can adjust the position of a cutting edge of a cutting edge when the cutting edge is partially worn in a process of feeding the same to a hopper and finely cutting the cutting edge by a cutting edge .The feeding device for shellfish culture of the present invention comprises a feeding part 110 in which an upper part is opened to feed a brown algae used as a feed in a shellfish style and a feeding screw 120 for feeding the charged brown algae forward And a discharge port 130 is formed at a front portion of the discharge port 130 so as to be able to receive the front end of the transfer screw 120. The discharge port 130 has a bolt-A hopper 100 formed with a discharge net 140 having a plurality of discharge holes 142 formed around a bolt through hole 141 formed therein, A base frame 200 for holding and supporting the hopper 100 A motor 300 fixed to one side of the base frame 200 and transmitting power to the conveying screw 120 by a power transmitting means 310 A controller 400 installed at one side of the base frame 200 to control the motor 300 A fitting groove 511 is formed at the rear of the feed screw 120 so that the end of the feed screw 120 is inserted and a bolt fitting hole 512 is formed through the center to communicate with the fitting hole 511, A plurality of blades 522 are radially formed on an outer circumferential surface of the rotary bushing 510 and the flow bushing 510 is inserted into the insertion hole 521 A cutting edge 520 which is seated on the cutting edge engaging jaw 513 so as to be engaged with the bolt engaging hole 512 of the discharge net 140 through the bolt through hole 141, And a gap adjusting bolt 530 that contacts the end surface of the feed
