Heres one you don hear too often about...but its one that id like to catch if i had to pick one...its kind of like a brown trout on steroids. on a flyrod..well, that would be my ideal fish. strong, aggressive, and they dont mess around...
heres some stuff off the internet i found...i dont know anyone thats caught one yet though.
"The freshwater dorado is considered to be the single most challenging native freshwater gamefish of South America. It is a radiant, golden-hued, salmon-like fish with an extremely powerful jaw and razor-sharp teeth. Unlike the salmon, however, the dorado does not succumb after spawning and never swims to the ocean. The dorado is an exceptionally strong swimmer and normally ranges in size from 5 to 20 pounds, although the world record is 70 pounds."