A raft (10, Fig. 2) suitable for an aquaculture sea cage (3) comprises a Y-junction 13 for connecting a branch pipe 15 to transport waste from a sea cage onto a common pipe (4), where a one-way valve 14 is connected to the Y-Junction； and where the raft is further adapted to gather pipes, cables and hoses which run to and from the sea cage. The gathering may be in the form of fastening means for attaching said pipes, cables, hoses and tubes. The raft may be shaped as a frame with one or more floatation elements therein. Also disclosed is an aquaculture installation comprising at least one floating sea cage (3A/3B/3C) with their own mooring and anchoring systems； and a central raft (1) comprising feed containers, a feeding installation, an electricity supply, and a mooring system independent of the sea cages, wherein one or more rafts as described above act as connectors between main components.
