The invention provides a dredge (10) for catching shellfish comprising a frame (12), a plurality of teeth (20) adapted for digging the seabed, and a collecting bag (14) attached to the frame. The harvest bag (14) includes a top panel (42) and a bottom panel (40, 140) connected to each other on the side sides and the rear edge to form a front opening. The lower panel (40, 140) includes a screen made of a flexible sheet material with holes (48, 148), typically a group of rectangular holes, drilled into it. Typically, the flexible sheet material is selected from natural rubber, artificial rubber and polyurethane. The scallop dredger of the present invention has less impact on the seabed than traditional scallop dredgers, which use ring or link assemblies for the bottom panel. The lower panel (40, 140) made of a flexible sheet material has a less rough surface on the seabed so that it slides better on the seabed, thereby less disturbing the seabed. deform around the obstacles that it encounters on the seabed, instead of clinging to these obstacles, as is the case with traditional dredgers with ring assemblies, hooking which results in a displacement of these obstacles and disturbance of the seabed. The reduced weight of the dredge, compared to traditional dredgers with ring assemblies, makes the collection bag more easily lifted over the elements obstructing passage, and causes less disturbance to the seabed.L'invention fournit une drague (10) destinée à capturer des mollusques et crustacés comprenant un cadre (12), une pluralité de dents (20) adaptées pour creuser le fond marin, et un sac de récolte (14) attaché au cadre. Le sac de récolte (14) comprend un panneau supérieur (42) et un panneau inférieur (40, 140) raccordés l'un à l'autre sur les côtés latéraux et le bord arrière pour former une ouverture donnant sur le devant. Le panneau inférieur (40, 140) comprend un crible fait en un matériau en feuille souple dans lequel sont percés des orifices (48, 148), typiqueme
