Aquaculture is defined as the farming of aquatic organisms including fish, molluscs, crustaceans and plants in controlled or selected aquatic environments, with some form of intervention in the rearing process to enhance production, such as regular stocking, feeding, protection from predators, etc.
There are many benifits and outputs such as water filtration, worm farm systems, watering your plants and even wash your dishes. There is a Japanese town that has tributries running through each house witch is used as a natural dish washer as the fish and creatures clean it for you. There is no limit to the possibliities as we are replicating a mini version of nature which has unlimited potential. From a fish tank to a farm running off a dam its all some sort of aquaculture. Water is Life!
Aquaponics is the most efficient way to farm your food. Its best implemented in arid or low rainfall areas. It can create many jobs and provide multiple benifits that were not available before. It does not need to be complicated or elaborate, you can get away with just useing an air pump and have a more nutural passive system.
Some diy airlift pump examples.