Since both the fish and plants are being exactly the right nutrients, like they would in nature, they grow on average 25% to 50% faster than they would in other artificial environments. Additionally, these ideal conditions should mean larger yields when harvest time comes around.
As both the fish and plants are able to get the nutrients they need without having to compete, all of their energy can be devoted to growing, rather than expanding roots or dealing with disease. The growing season can be controlled through heaters and artificial lights, allowing you to grow offseason crops year-round.