Asian arowana are medium sized (maximum c. 60-90 cm total length) freshwater fish inhabiting large rivers, swamps, and lakes in Southeast Asia. Known natural range includes Cambodia, Lao PDR, peninsular Malaysia, the Philippines, Vietnam, and Indonesia (Kalimantan and Sumatra). Asian arowana exhibit several natural color forms including red, green, golden, and silver. There is speculation, but not scientific confirmation, that these may represent genetically distinct subspecies. Wherever it occurs, the species may be naturally rare with each spawning population probably containing 100-200 individuals and entire watersheds supporting populations of thousands of individuals. There has been no systematic survey work or quantitative assessments on wild populations.