An object of the present invention is to provide a dredge that can be reduced in weight while maintaining a center of gravity and a posture at the time of towing, can reduce the labor for moving and transporting, and can be used regardless of the hardness of the bottom of the water. A dredge for collecting sediments and creatures at the bottom of the water, wherein a canna attached obliquely to the horizontal direction of the dredge and an opening frame 3 on which the canna is mounted up and down are substantially formed by a side frame 5. It is mounted in the center and each part is frame-shaped and lightweight, and it has a shape that can be used without problems from a small size that can be thrown offshore with bare hands from the shore to a size that can be towed using a ship. Also, the side frame portion can be detached, disassembled, and assembled by screws or the like on the side surface (short side portion) of the opening frame, and can be stored in the opening frame when being carried. In addition, the miniaturization and weight reduction made it possible to add a weight or the like to the front of the dredge body as a measure to prevent the dredge body from floating from the bottom during towing. [Selection] Figure 2【課題】重心や曳航時の姿勢を維持したまま軽量化でき、移動および運搬の労力を下げることができ、水底の底質の硬軟を問わず使用が可能なドレッジを提供する。【解決手段】水底の堆積物や生物等を採取するドレッジであって、ドレッジの水平方向に対し斜めに取り付けられたカンナと、カンナを上下に装着した開口部枠３が、側面枠５のほぼ中心に取り付けられ各部が枠型で軽量化され、岸辺から素手で沖へ向かって投げられる小型サイズから、船舶を用いて曳航可能なサイズまで問題なく使える形状とした。また、開口部枠の側面（短辺部）にネジ等によって、側面枠部位を脱着・分解・組み立て可能で、持ち運びの際に開口部枠部内に収納できるようにした。さらに、小型化および軽量化により、曳航中にドレッジ本体が水底から浮上するのを防止する措置として本体前方へ錘等を追加可能とした。【選択図】図２
