Fish pen (1) comprising a buoyancy member (11) encircling an enclosure (2) for raising fish (9). The enclosure (2) comprises a side wall (23) and a bottom (25). The fish pen (1) comprises a crowding net (3) positioned within the enclosure (2), and the crowding net (3) forms a top edge (30). The top edge (30) is provided with buoyancy means (31), two side edges (33) and a bottom edge (35), and the length (L) of the crowding net (3) between the two side edges (33) is larger than a diameter (De) of the enclosure (2), and wherein the crowding net (3) is fastened to the side wall (23) along the side edges (33). A method for managing fish (9) in a receptacle for fish by use of the crowding net (3) is disclosed.
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