A fish farm construction for farming of fish is described, comprising a closed net cage (12) fastened to a floating collar (10) which is, at least, partially submersed in the water, and also, at least, one inlet pipe (14) for the supply of fresh water, where water is supplied to the net cage (12) with the help of one or more water distributors and an outlet (30) in a lower part of the bottom section of the net cage for outflow of water and waste from the net cage via an outflow pipe (32). The floating collar (10) is formed with a rigid construction where the closed net cage (12) comprises, at least, two separate walls, and the floating collar comprises, at least, one water reservoir (24 80) connected to said, at least, one inlet pipe (14) to receive and distribute fresh water, and also a number of water distributors (22) arranged mutually spaced apart around the floating collar (10) and which is arranged to receive and distribute fresh water in the net cage (12). A method for through-flow of water in a fish farm construction is also described.
