To provide an enclosure that can be easily cleaned. A fish-breeding enclosure including: a frame 3 constituting the sides of a cuboid； a first net 11 covering a right side surface 5, a bottom surface 7, and a left side surface 9 of the frame 3； a first net feeder 19 for feeding the first net 11 and a second net 17 that covers a front surface 13, the bottom surface 7, and a rear surface 15 of the frame 3； and a second net feeder 21 for feeding the second net 17. When the first net 11 or the second net 17 is renewed, the first net 11 or the second net 17 is drawn out from the first net feeder 19 or the second net feeder 21, respectively.[課題]提供一種能輕易地進行清洗的魚池。[解決手段] 一種魚類繁殖用魚池，包含：框架3，構成長方體的邊；第一魚網11，覆蓋框架3的右側面5、底面7及左側面9；第二魚網17，覆蓋框架3的正面13、底面7及背面15；第一魚網供給部19，供給第一魚網11；以及第二魚網供給部21，供給第二魚網17；其中，在更新第一魚網11或第二魚網17的情況，從第一魚網供給部19與第二魚網供給部21分別拉出第一魚網11或第二魚網17即可。
