Of course there's going to be the person who was born without a funny bone who will point out that whales are mammals and not fish.
I hate those people.
So are dolphins.
But on fish. I have a 29 gal. tank with two pearl gouramies.
They have two “wiskers” hanging down from their chest that they can move like two long fingers.
I have trained them to touch the characters on my water-resistant phone and the next project is to get them to start writing code.