yes u can click once to a fish and click where it says train and then there is a minigame in which if u win u learn a trick to your fish.But be careful because u can play this game only every 4 hours
try: buying a hoop that your fish can fit through, then, hold food on the end of it(other side of the fish) and the fish will go through the hoop to get it, repeat and soon your fish will learn that if it goes through the hoop it gets food