PROBLEM TO BE SOLVED: To provide a boat seine that enables adjustment of a volume of resistance of the boat seine received in the sea according to the environment of the daily fishing ground, and can dynamically adjust a boat towing speed.SOLUTION: A boat seine 100 of the present invention is configured by including a wing net portion 110, a fish collecting bag portion 140, a body net portion 120 between them, a Jellyfish extractor 130 as an inner bag body in the inside of the body net portion 120, and a tidal volume adjustment body 150. In the body net portion 120, a tide cut-out portion 125 is provided in which the mesh becomes coarse more than the mesh of other portion in a portion of the side and the resistance caused in the boat towing is reduced. The tidal volume adjustment body can dynamically be mounted to this tide cut-out portion 125, and the resistance in the sea is increased or decreased. The volume of the resistance in the sea is adjusted by the presence or absence of mounting the tidal volume adjustment body 150 or a mounting volume, and thereby the boat towing speed is adjusted.SELECTED DRAWING: Figure 2【課題】 日々の漁場の環境に応じて、船曳き網の海中で受ける抵抗の大きさの調整を可能とし、船曳き速度を動的に調整できる船曳き網を提供する。 【解決手段】 本発明の船曳き網１００は、袖網部分１１０と魚取り袋部分１４０と、両者の間の胴網部分１２０と、胴網部分１２０の内部に内袋体としてクラゲ抜き用排出部１３０と、潮抜き量調整体１５０を備えた構造となっている。 胴網部分１２０において、側面の一部において網目が他の部分の網目よりも粗い網目となり、船曳きの際に生じる抵抗を小さくする潮抜き部１２５を設ける。この潮抜き部１２５に対して潮抜き量調整体を動的に取り付けることを可能とし、海中での抵抗を増減せしめる。潮抜き量調整体１５０の取り付け有無または取り付け量によって海中での抵抗の大きさを調整し、船曳き速度を調整せしめる。【選択図】 図２
