Caz Graham visits a farm which produces millions of fish for restocking rivers.
Conor Woodman asks how farmed Scottish salmon production can increase by 50% sustainably.
Tom Heap finds out if fish farming can really feed the planet without trashing our oceans.
Ruth Sanderson meets a Northern Irish oyster farmer.
Exploring Pacific oyster farming on the Northumberland coast with Helen Mark.
Brown, blue and rainbow - the world of commercial trout farming.