Species learning profile
Harlequin rasbora
Trigonostigma heteromorpha
Harlequin rasbora (Trigonostigma heteromorpha) is a freshwater fish associated with river habitat in Southeast Asia. A black triangular patch marks the rear half of its copper body.
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At a glance
- Água
- Água doce
- Habitat
- Rio
- Comprimento máximo
- 5 cm
- Distribuição
- Southeast Asia
- Família
- Danionidae
- Ordem
- Cypriniformes
Observe
How to identify Harlequin rasbora
- A black triangular patch marks the rear half of its copper body.
- Guide context: river habitat in Southeast Asia.
- Reported maximum length: 5 cm — about hand-length or smaller. Maximum is not the same as typical adult size.
Field note: color, size, and markings can change with age, sex, season, depth, and lighting. Use several traits together.
Place and pattern
Where it lives—and how it behaves
Habitat and range
This species is associated with river habitat across Southeast Asia. Flow, seasonal floods, connected side channels, and access to spawning reaches all shape its river habitat.
Behavior
Schools in soft, plant-filled water
Food-web connections
What it eats and why it matters
Diet
Insects, worms, and crustaceans.
Ecological role
Transfers tiny invertebrates to larger stream fish.
Remember
One fact worth keeping
Harlequin rasbora pode chegar a cerca de 5 cm e costuma viver perto de Rio.
Think like a conservationist
A conservation lens
River fish depend on connected water. Dams, blocked migrations, pollution, and altered flow can matter even when the channel still looks wet.
This habitat lens is not a current population-status assessment. Status can differ among regions and change as new assessments are published; follow the reference links and local fisheries or wildlife agencies for current decisions.
Recall
Quick knowledge check
Which habitat is most closely associated with Harlequin rasbora in this guide?
Keep exploring
References and further reading
Fishdle summarizes stable identification and ecology concepts in plain language. Taxonomy and population knowledge continue to change, so use primary assessments and regional authorities for conservation or management decisions.
Make connections