Which is a disadvantage of using aquaculture to produce fish? apes?

I think one disadvantage of using aquaculture to produce fish is the use of grain for feed for some species. Aquaculture is the farming of fish, crustaceans, molluscs, aquatic plants, algae, and other organisms. It involves cultivating freshwater and salty water populations under controlled conditions, and can be contrasted with commercial fishing, which is the harvesting of wild fish.

Sorry its not enough info