44. Various methods of aquaculture can be used to grow species of marine fish. Consider the figure below, which shows one way that an aquaculture system can be designed to allow water to flow freely through the net. Explain whether this represents an open or closed system and one benefit of using this type of system A. This is a closed system, and one benefit is that it reduces the risk of parasites affecting the fish.

B. This is a closed system, and one benefit is that it is unlikely to attract predators.

C. This is an open system, and one benefit is that it does not require as much filtration and maintenance.

D. This is an open system, and one benefit is that it reduces risk of contracting disease from outside fish.