Abstract: A fishing device, which is a so-called side planer designed to be towed by a boat and which comprises a float (1) to keep the fishing device afloat, a holding fixture (2) for the attachment of a tow line used to draw the device, and a keel (3) attached to the float and having a plate-like fin (4) to steer the fishing device slightly outward from the direction of travel of the boat towing the device, and a weight (5) to keep the fishing device in an upright position. The float (1) is a bottle. The fishing device comprises a frame (6) consisting of a single solid body of plastic material, forming a socket-like casing (7) adapted to the shape of the outer surface of the bottle to receive the bottle inside the casing so as to attach it to the frame.