speaking of fish memory - I use to have an Oscar that would jump up partially out of the water to take snacks from my fingers. Well one day he got overly excited and jumped clear of the tank, hit the floor, and the cat pounced on it immediately. I rescued it and got it back into the tank, but from that day on when every anyone walked near the tank it would hide at the back and bottom of the tank. No more tricks for snacks.