Dogtooth characin or Vampire fish, Hydrolycus armatus. It's a predatory fish that lives on Amazon, Orinoco and Essequibo river basins. Occasionally makes its way into the aquarium trade. Growing to more than 3 feet in total length makes it a very highly sought-after food and game fish. The enlarged canine teeth enable them to trap their prey, thus allowing them to hold onto the fish until they can be positioned safely for ingestion, which occurs whole and head-first. From Orinoco River. Composite image