DESCRIZIONE
An offshore fish farm (F,N;F', N; F' ',N) comprises a flexible netting (N) suspended to a floating frame structure (F;F';F"). An upper netting part is above sea level and a lower closed netting part (32) is submersed. A floating frame structure (F) comprises at least three towers (1,2, 3, 4, 5, 6) having a top end part (lb, 2b, 3b, 4b, 5b, 6b) with a free top end (Id, 2d, 3d,4d,5d,6d) above sea level and an opposite submersed bottom end part (lc, 2c, 3c, 4c, 5c, 6c) with a bottom end (la, 2a, 3a, 4a, 5a, 6a) floating above the sea bed. The submersed bottom end parts (lc, 2c, 3c, 4c, 5c, 6c) of the at least three towers (1,2, 3, 4, 5, 6) are circumferentially connected by means of crossbars (13,14,15,16,17,18) into a polygonal bottom frame (P). Upper flexible lines (26, 27, 28, 29, 30, 31) or upper, flexibly suspended, rigid connections (45,46,47,48,49,50) extend between the top end parts (lb, 2b, 3b, 4b, 5b, 6b) to circumferentially connect the towers (1,2, 3, 4, 5, 6) at a distance from the respective free top ends (ld,2d,3d,4d,5d,6d). The bottom ends of the at least three towers (1,2, 3, 4, 5, 6) are radially connected to a common centre (25) by means of first lower flexible lines (19,20,21,22,23,24), and the first lower flexible lines (19,20,21,22,23,24) are heavier than the upper flexible lines (26,27,28,29,30,31) or heavier than the upper, flexibly suspended, rigid connections (45,46,47,48,49,50).