I wondered about that one.
“Live goldfish have excellent memories. They learn to recognize faces. They get excited when they see the familiar face that feeds them.”
Our goldfish does the above quite obviously. It also swims toward me when I wave my fingers a certain way and I can “lead” it around the tank a bit by doing that.
I’d love to see that! It sounds like a special fish.
I’ve watched videos of goldfish that have been taught to swim through plastic hoops in exchange for food. I wouldn’t have the patience to teach them such behavior, but they’re definitely capable of it.