I think I'm gonna have to take a trip to my lfs and take pics of all the fish that have been on river monsters.
I have seen arapaima, white sturgeon, rtc alligator gar, piraiba catfish, payara, rbp's. Pacus, black rhoms, elongated rhoms, AGT's, wolf fish, peacock bass, FW rays, dorado's, barramundi and I think that's about all I can think of haha.
They also have a TON of fish that get large and in their own right are river monsters even of they never been on the show.
For the record I'm such a huge fan of the show. I wish I would hit the mega millions. So I could have my house built around a 50,000g tank lol. (sick amazon theme!)