VU

Brunei Beauty

Betta macrostoma

Declining

Overview

A detailed profile for this species is sourced from the IUCN Red List of Threatened Species as assessments become available.

Betta macrostoma faces significant pressure from habitat degradation in its native Brunei peat swamp forests, where logging and agricultural conversion have reduced suitable breeding areas. The species is also threatened by over-collection for the international aquarium trade, driven by its striking appearance and rarity in captivity. Water pollution from palm oil plantations and urban development further compromises the acidic, tannin-rich waters this species requires for reproduction.

Threat summary

Habitat

Betta macrostoma inhabits shallow, slow-moving streams and pools within primary peat swamp forests of Brunei. These environments are characterized by extremely soft, acidic water with high tannin content from decomposing organic matter, creating the dark, tea-colored conditions essential for the species' breeding behavior.

FRESHWATER· major

Conservation measures underway

Resource & habitat protectionSpecies managementSpecies recoveryAwareness & communicationsCompliance and enforcement

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Frequently asked questions

Why is Brunei Beauty classified as Vulnerable?
Brunei Beauty is classified as Vulnerable because the population is declining and the species faces a high risk of extinction in the medium-term future if current pressures continue. Betta macrostoma faces significant pressure from habitat degradation in its native Brunei peat swamp forests, where logging and agricultural conversion have reduced suitable breeding areas. The species is also threatened by over-collection for the international aquarium trade, driven by its striking appearance and rarity in captivity. Water pollution from palm oil plantations and urban development further compromises the acidic, tannin-rich waters this species requires for reproduction.
Where does Brunei Beauty live?
Brunei Beauty occurs in Brunei, Indonesia, and Malaysia. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Brunei Beauty?
The main threats to Brunei Beauty are ai-1, ai-2, ai-3, and ai-4. The full IUCN-classified threat record for this species is detailed on the species page.

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