The Blue Mahseer is a rare and impressive large-growing freshwater fish known for its powerful, streamlined body, big reflective scales, and beautiful blue-toned sheen that becomes more noticeable as it matures. Also sold under names like Blue Mahseer Barb, Stracheyi Mahseer, Blue Tor, Waterfall Carp, and Pla Puang, this species is a standout choice for advanced hobbyists keeping large aquariums, monster fish communities, or indoor pond-style setups.
Scientifically known as Neolissochilus stracheyi, this Southeast Asian cyprinid is related to barbs, carps, and other river-dwelling mahseer species. It is an active swimmer that appreciates clean, highly oxygenated water, steady flow, and plenty of open swimming space. Juveniles may look more silver or gold at first, but mature specimens can develop a stunning metallic glow with blue undertones along the body and fins.
Blue Mahseer are generally peaceful for their size but should only be kept with other fast-moving, similarly sized tankmates. Avoid housing them with tiny fish that may be seen as food or slow, delicate fish that may be outcompeted during feeding. Great potential tankmates include larger barbs, silver dollars, datnoids, bichirs, larger peaceful cichlids, arowanas, and other robust community or monster fish species.
This is not a nano or beginner fish. The Blue Mahseer is best for experienced aquarists who can provide a large aquarium, excellent filtration, strong aeration, and consistent maintenance.
Quick Care Guide
Scientific Name: Neolissochilus stracheyi
Synonyms / Older Scientific Names: Barbus stracheyi, Labeobarbus stracheyi, Tor stracheyi
Common Names: Blue Mahseer, Blue Mahseer Barb, Stracheyi Mahseer, Blue Tor, Waterfall Carp, Pla Puang, Mahseer Barb
Family: Cyprinidae
Origin: Southeast Asia, including Myanmar and Thailand river systems
Adult Size: Up to about 20–24 inches
Temperament: Active, generally peaceful, best with similarly sized fish
Difficulty: Intermediate to advanced
Minimum Tank Size: 180 gallons or larger recommended for long-term care
Temperature: 72–80°F
pH: 6.8–7.8
Diet: Omnivore; accepts quality pellets, frozen foods, insects, shrimp, vegetable matter, and occasional fruit-based foods
Water Flow: Moderate to strong flow preferred
Aquascape Style: Open swimming space with rocks, driftwood, and strong filtration
