I haven't fished for a long time, and I've never caught anything really huge. But once when I was, eh, 14 or so, I caught a 10-pound cat. And a few yeard before that, I caught a good-sized peacock bass... I'd say about the same weight.
As for saltwater catches.. heh, this isn't really a catch, so to speak, because it broke my line. Whatever it was, it snapped the line as soon as I picked up my pole to start reeling. It must have really liked squid.