6 Show Fish.

He isn't fat or preggers - he is from a mutant variety of goldfish.

Why his body is like that - ask a fish veterinarian that does autopies,
I don't know - but the whole breed is like that now.

With a body like that and long fins,
he has to work hard to swim.

And his eyes are somewhat protruding.
Reminds me of a show-type Pekingese dogs.