1. a large freshwater fish of South America, related to the tarpon, valued as a game fish and aquarium fish
Usage: also called arapaima or pirarucu in some regions; scientific name: Osteoglossum bicirrhosum

Examples

• The aruana is one of the largest freshwater fish in the world.
• Collectors prize the aruana for its striking appearance in aquariums.
• The aruana can leap several feet out of the water to catch insects.
• In its native habitat, the aruana inhabits slow-moving rivers and floodplain lakes.
• The aruana's elongated body and large scales make it easily recognizable.