Fish Food Sumpliments

Hi all

I was watching discovery channel and i saw that a guy added like a protein powder to the food and his fish grew and became or looked almost like a body builder!!! But the fish were for fishing but i want to know if that is possible???

 

There are supplements avaliable for your fish, which you should be able to find at most LPSs, LFSs and Koi facilities. I know the food they use for aquaculture has a high protein content to make the fish grow big, qucikly.