So what exactly would we consider a lake/river monster? To me, that shit is a legitimate river monster. A freakishly large and imposing fish that if it really wanted to, could eat a small child.
Maybe not the traditional folklore/ rarely sighted sense, but still.
That's the type of shit they caught on the show River Monsters, and I agree that it does count as a river monster. It's an amazing animal. As much fun as it would be to have dinosaurs lurking around in lakes or jungles, I just don't think they exist. There are very few large creatures that haven't changed in 66 million years.