Taxonomy & naming
Francis Day described the species in 1870 from the Irrawaddy River between Prome and Mandalay in Myanmar. It was first placed in another genus, so the authority is in parentheses under Raiamas. Raiamas is in the family Danionidae and has African and Asian members. The English name Burmese trout comes from FishBase.
Morphology
An elongate, silvery, trout-like fish with a large mouth and spotted flanks, as the name guttatus (spotted) says. FishBase gives a maximum of 12 in SL for males and unsexed fish.
Habitat
FishBase lists India and the Irrawaddy in Myanmar, plus the Mekong, Chao Phraya and Salween basins and the northern Malay Peninsula. It is potamodromous. Adults are usually collected in clear water with moderate to swift current, in shady areas and over muddy bottoms in deep hill streams, while juveniles stay in quiet pools further downstream. It also occurs in medium to large rivers, flooded fields and fast mountain streams.
Feeding
FishBase gives the diet as insects and small fishes.
Mating
Mating behaviour is not described.
Breeding
Reproduction is not described, and no captive spawning has been documented.
In the aquarium
FishBase gives no temperature or pH range. A fast-moving 12 in predator needs a large, long tank with current, a tight lid and no small tankmates, since small fishes are part of its diet. FishBase notes that it is rarely seen in markets and is a food fish in Nepal.
Conservation
The IUCN Red List category is Least Concern, assessed on 14 April 2020. Specific threats are not described.