A trawl door (2) for remote-controlled adjustment under water of the active surface area of the trawl door (2). The trawl door (2) comprises an upper and lower surface portion dis- posed on either side of a central axis (6). Each surface portion is provided with an opening (10a, 10b) with an associated, movable damper (12a, 12b) structured in a manner allowing it to be moved, completely or partially, over the opening (10a, 10b). The distinctive characteristic of the trawl door (2) is that said surface portions have a hydrodynamic shape and are comprised of an upper and lower wing (A,B) disposed on either side of a tube (4) formed about the central axis (6) - wherein each damper (12a, 12b) is structured movable along an axis (24) extending transversely to the central axis (6) - wherein each damper (12a, 12b) is movably connected to a driving device.(28a, 28b) and - wherein the central tube (4) comprises a remote-controlled communication and control means (32) for individual operation of each driving device (28a, 28b).
