Definitely -- most fish found in aquaponics systems are meant to be eaten, like tilapia, carp, trout, and bass. However, if your aquaponics set-up is filled with beautiful goldfish and koi, these aren't typically meant to be caught and eaten. Tilapia is one of the most common fish you'll find in aquponic systems due to their resilience, quick growth rate, and good flavor. Catfish are particularly easy to raise due to their high-tolerance to ammonia and other dissolved chemicals, and are reccomended for beginner farmers, or those without a reliable power source.
Ornamental fish can still be valuable to an aquaponics system, even if they aren't meant for eating. Goldfish, for example, are durable and attractive fish that can live in a variety of water qualities, making them fairly easy to take care of. Koi are larger, and live for a long time. As they get bigger they'll produce more waste, meaning that the aquaponics system will need more cleaning and filtration in turn.
