The freshwater sawfish is featured on the first of two new Megafish shows this month on the National Geographic Channel.  The first show, “Monster Fish of Australia”, premieres Monday, Oct. 19.  The freshwater sawfish, Pristis microdon, can grow to 23 feet long. It has a long, flat snout and from 14 to 22 razor sharp “teeth” on the outside of the snout.  Some say it looks like a cross between a shark, a stingray and a chainsaw.  Together with local scientists, Dr. Zeb Hogan takes a dangerous journey 150 miles up the Fitzroy River, encountering saltwater crocodiles, bull sharks and giant stingrays along the way, as they seek to tag, study, and protect this endangered and bizarre-looking predator.