I don't know about a goldfish, but I can tell you for sure that my parrot cichlid has quite a good memory.
I'm the one that feeds him, so if someone comes in the room, he checks to see who it is. He swims up to the glass, and if it's anyone other than me, he swims away and hides behind the plants. If it's me, he goes straight to the corner of the tank where I always feed him, and goes up to the top, waiting for me to drop his food in.
"We give dogs the time we can spare, the space we can spare and the love we can spare. And in return, dogs give us their all. It's the best deal man has ever made" - M. Facklam
"We are raised to honor all the wrong explorers and discoverers - thieves planting flags, murderers carrying crosses. Let us at last praise the colonizers of dreams."- P.S. Beagle
"All that is gold does not glitter, Not all those who wander are lost; The old that is strong does not wither, Deep roots are not reached by the frost. From the ashes a fire shall be woken, A light from the shadows shall spring; Renewed shall be blade that was broken, The crownless again shall be king." - J.R.R. Tolkien
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