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Sure, those BIG catfish are impressive and dangerous, but you have to check out the episode about the Amazon River catfish species.
Not the BIG ones, but the LITTLE one. These are not catfish in the way we think of catfish, but man are they terrible.
Bottom line: one species uses the urine that is expelled by the larger fish to track them down and attach to their gills so they can feed of their blood. There is one confirmed case of a man having one of these fish swim up his urethra and required surgery for removal.
The other is a carnivore/scavenger that eats meat like a pirhanna.
There were confirmed reports of bodies pulled from the river that had no internal organs, just hundreds of these fish that had entered the body through one hole chewed by the fish.
Real nasty critters, and even more dangerous river for anyone unlucky enough to be in it at the wrong time and place.
It's a great show though because it's based on factual information, not speculation.
Oh, how about freshwater maneating sharks? They have those as well. Seems that some bull sharks have been living in some of the freshwater rivers in South America.
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