Problem to be solved: to provide a clam fishing ground that is able to create the environment suitable for the growth of the clam by adjusting the salinity of brackish water in the breeding area without the large scale artificial change to the tidal flat developed in brackish lake.A wall body which is constructed in a tidal flat developed in brackish lake, and one side side is directed to the land area, and the water level of the brackish water is repeated due to the tidal change and the water repellency is repeated by the tidal level, and the surface of the wall of the wall is blocked by the water inflow of the brackish water when the wall is released, and the water submerged with the water falling of the wall The growing area is provided with a growing area, and a water passage in which the bottom side opening is disposed in the growth region and the bottom side opening is disposed at the bottom of the lake of the brackish lake located on the other side of the wall body.Diagram【課題】汽水湖に発達した干潟に対して、大規模な人為的改変を加えることなく、かつ経済的に構築でき、育成領域における汽水の塩分濃度を調整してアサリの生育に適した環境を創出することの可能な、アサリ漁場を提供する。【解決手段】汽水湖に発達した干潟に構築され、一面側を陸域に向けるとともに潮汐による汽水の水位変化により干出と水没を繰り返す壁体と、該壁体の前記一面側であって、該壁体が干出した際に汽水の流入が堰き止められ、該壁体の水没と共に水没する範囲に配置される育成領域と、該育成領域に干潟側開口が設置され、前記壁体の他面側に位置する前記汽水湖の湖底に湖底側開口が配置される通水管と、を備える。【選択図】図2
