A fishing device that can act in one mode as either a diver or side diver, and in a second mode as a side sub-surface planer. The device includes a top plate, a curved bottom plate joined at their leading and trailing edges. Side plates are attached to the right and left sides of the top and bottom plates to thereby form a watertight compartment. A keel member is mounted on the curved bottom plate in a manner adapted to allow the keel member to be adjusted and held at any position between substantial abutment with the bottom edge of the right side plate and substantial abutment with the bottom edge of the left side plate. A keel weight is attached to the keel member. To cause the device to act in its second mode, a planer mode arm is removably attached to one of the side plates.