the african arowana or nile arowana

adventure african amazon amazonia america ancient animal aquarium aquatic arapaima arapaimas armor arowana big black body bony bonytongue carnivore coast deep dive ecology endangered exotic extinction eye face fauna ferocious fin fish fishing fresh freshwater giant giga gigas grown head horizontal isolated juvenile lake large largest long marin monster nature nile predator predatory prehistoric rare river scale shot south species studio tank thin threatened tongue torpedo tropical underwater unique water wild wildlife young