Abstract: A device designed to be removably attached to a boat gunwale which both guides and supports a baited trot line for the capture of marine crustaceans (crabs) by a person at a catching station wielding a net. Attachment to the gunwale consists of two mounting arms which can be secured by a variety of means. A telescoping arm permits adjustment of the distance between the boat hull and the trot line. The arm has a horizontally disposed guide and support roller mounted in a bracket which is affixed to the telescoping part of the arm. As the boat moves parallel to the baited trot line, the trot line is carried over the roller. This causes the baited section to rise to the surface of the water allowing the person to capture (apprehend) the crab.