There are several types of fish that do well in an aquaculture setting. The best choice is tilapia: they grow fast and eat anything.

They can grow from fry to harvest size (one to two pounds) in as fast as eight months. This doesn't seem super fast, but once the system is producing, the fish will be numerous.

According to the numbers I have used, this system should be capable of producing six to ten pounds of fish per week (numbers subject to revision)