And yes, for you smartypants out there, the Sturgeon are even larger than this, but they are not exclusively freshwater fish. Duuh~! Sturgeon spend most of their lives at sea, or in brackish water, and only swim into freshwater rivers to spawn. Arapaima are, like sturgeon, a very primitive form of fish covered in very large, bony-like scales. They are members of the Osteoglossidae, having a "bony tongue", that has a second set of teeth embedded into it. This allows it to chew up catfish that are protected by armored plates.
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