Fish are complex living organisms, but they still only have a fixed set of requirements. By supplying what a specific species of fish requires, while avoiding diseases and other disasters, you can harvest a steady supply of healthy, low-fat protein that can fetch a healthy price in the right market. However, raising fish in an aquaponics system is often trickier than you might expect at first. Proper fish selection, sourcing healthy fry and fingerlings, and knowing how to supply for the fish’s needs, goes a long way in ensuring aquaponics success.