HomeFreshwater aquarium fishLoachesVaillantella maassi Vaillantella maassi Scientific name: Vaillantella maassi Weber & de Beaufort, 1912 Vaillantella maassi is a freshwater fish of the family Balitoridae that grows to about 12.5 cm (4.9 in). It is semi-aggressive and needs a tank of at least 115 L (30 US gal), water at 22–26°C (72–79°F) and a pH of 6.5–7.2. Native range: Asia, Malaysia, Brunei and Indonesia. Vaillantella maassi care at a glanceTemperamentSemi-aggressiveAdult size12.5 cm (4.9 in)Minimum tank115 L (30 US gal)Temperature22–26°C (72–79°F)pH6.5–7.2DietOmnivore. Accepts sinking pellets, frozen foods and brine shrimp. Species factsScientific nameVaillantella maassiFamilyBalitoridae (River loaches)OrderCypriniformes (Carps)ClassActinopterygii (Ray-finned fishes)Maximum length12.5EnvironmentFreshwater; demersalClimateTropicalDistributionAsia: Malaysia, Brunei and Indonesia.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) More loachesHomaloptera orthogoniataGastromyzon ctenocephalusAborichthys elongatusAborichthys kempiAcanthocobitis rubidipinnisBlyth's loachSyncrossus berdmoreiSee all loaches SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0. Aquarium care parameters compiled, checked and converted to metric and imperial units by Guppies.za.net.Last updated 28 September 2026