You mean dumb fish.

And a really smart fish would hang out somewhere in the hadal zone, we don't even know half the species that exist there.

No. I mean what I said.

Unless by smart fish you mean either unhatched fish -OR- fish too small to be caught.

Fish have ranges. And hiding in the hadal zone is the fish equivalent "I'll hide in the hell desert". Not a smart plan.

It's not meant to be taken literally.

As I suspected, there is nothing here anymore

So you may have eaten smart fish, and you still don't know what a smart fish tastes like.

How do you know?

That fish is so smart, it was never even spotted.

So smart it aborted itself from this timeline.