I've been wondering about this for a long time. Many articles on the net gloss over the fact that conservation of energy also holds for "closed" aquaponics syst

I've been wondering about this for a long time. Many articles on the net gloss over the fact that conservation of energy also holds for "closed" aquaponics systems, and that in the end, we eat biologically processed fish food that needs to be bought in the first place. Fish food is probably produced with less stringent rules than food for humans, e.g. regarding heavy metal content \m/ and other contaminations.