Closed flexible cages (CFC) offers a route for developing closed fish production systems (CFPS) that might be faster than developing new CFPS in rigid material. The rationale behind this is that flexible floating systems are not far from the current net c age floating fish farm systems, and can be used in existing floating fish farms in combinations with net cages.It is important that any new system really do reduce sea lice infestation, reduce release of nutrients and reduce the probability of fish esca ping. The CFCs are structures that differ from most other ocean structures and since there is little previous experience with these kinds of structures, the importance of conducting basic research related to behaviour and operation, to avoid accidents an d unforeseen incidents, cannot be emphasized enough. The flexibility and deformation of the bag is closely coupled to the hydrodynamic forces, making the hydrodynamic load far more difficult to understand than that for a rigid structure. Therefore, techni ques to estimate dynamic movements and internal stresses need to be developed in order to limit the risk of fish escaping due to structural collapse or operational failures.In addition the enclosed body of water must be properly maintained to obtain goo d water quality, fish welfare and high bio-security. This project proposes to establish a better understanding of the internal flow and to look into ways of maintaining good water quality even as the bag deforms. The CFC system to be considered in this pr oject will use technology to remove seal lice and sludge. Reaching the objectives of the project will give the industry a better understanding of the behaviour, operation and reliability of closed flexible cages, and it will give the scientific community a starting point for further work on these systems. The contribution from the project will help the industry to increased reliability, safety and predictability of their CFC products.
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