What a coincidence, I just had some sea kittens for dinner.
Seriously, though, I think those nutcases have stooped to a new low. You'd think that a simple high school course in biology would convince them that animals aren't people. There's just no reasoning for that kind of viewpoint. Besides, comparing the anatomy and intelligence of fish to cats is just idiotic. And, though I'm really not a cat person, it's a major insult to kittens.
Come on, fish are the Magikarp of the animal kingdom: They're as dumb as dirt and they aren't as well evolved as we are.