科: Osphronemidae
Brunei Beauty（Betta macrostoma）はオスフロネムス科に分類される淡水魚で、東南アジアに分布する。成魚は約 4.5–6.6 cm、適水温 24–28 °C。
Betta macrostoma is a Osphronemidae from Southeast Asia. In the wild it prefers still waters, rice paddies and slow streams; in the aquarium it stays mostly peaceful. Plan on 4.5–6.6 cm of adult fish at 24–28 °C. Related profiles: Betta imbellis, Betta smaragdina, Betta splendens.
中級向き。水質の安定が重要。Mostly peaceful; slow, deliberate movers that dislike chaos。A pair bonds loosely; keep décor between rivals。
適水温 24–28 °C。24.0–28.0 °C typical for the genus。Heater required; stable warmth。
成魚 4.5–6.6 cm 前後。Upper; surface-orientedのため 52 L 以上の水槽を推奨。
Omnivore; flakes, small pellets and frozen foods。人工飼料に冷凍餌を組み合わせて。
Mostly peaceful; slow, deliberate movers that dislike chaos。混泳の相手：Other calm labyrinth fish — Share the slow lane。Fin-nippers like tiger barbs — Torn fins and endless stressは避ける。
原産地は東南アジア。Still waters, rice paddies and slow streamsに生息。Still to very gentle water。Tolerates low oxygen; labyrinth breather。
飛び出す種。ふたをしっかり閉める。
Surface bubble-nester with dedicated male guarding。Males larger with longer fins。