Apparatus for detaching, separating and collecting organic materials having different density; especially liver from fish entrails, which comprises a tank furnished with water or salt water and encasing a conveyor with carrier plates oriented across the direction of movement of the conveyor, and further is provided with an inlet and an outlet for the organic material. The tank also has detaching tools which comprises a stationary part and a movable part. The stationary part comprises a bracket plate with a curved cutting surface extending away from a free cutting edge of the bracket. The movable part comprises at least one detaching tool/knife, which moves or rotates along the cutting edge and is oriented in a small angle or no angle to the edge, wherein the curve form of the surface is in conformity with the path of the knife/knives; and further has synchronizing device which allow a knife to pass by the cutting edge simultaneously with one of the carriers passing by on the opposite end of the cutting edge.