Aquaculture is a growing source of healthy protein for millions of people around the world, but there are big differences between farming fish on land and at sea.

Scotland's salmon farming industry has begun farming a new type of fish, specifically to keep salmon clean.

Global manufacturer Skretting has extensively tested a fish food that is totally free of wild caught fishmeal.

At the moment, he has 300 fish fertilizing watery beds that are filled with rows of plants. Springworks Farm, Kenkel’s aquaponics farm in Lisbon, Maine, works as a closed loop.