Arapaima is the largest freshwater fish.
Arapaima fishes have tapered, copperish-green head, upturned mouth, and scaly streamline bodies that are black with a white center. A dorsal fin stretches along their backs toward their massive tails which are red. They are obligated to air breathers and can only stay underwater for 10 to 20 minutes. Arapaima fishes exclusively inhabit the Amazon …