Betta raja

Mature males have very long pelvic fins and black margins on the anal fin and lower tail.

Mature males have very long pelvic fins and black margins on the anal fin and lower tail. A mouthbrooding betta from Sumatra, previously mislabeled B. fusca in trade.

Adult length: Up to 7 cm (standard length, without the tail fin)
Water temperature: 22–27 °C
Hardness: 0–10 dGH

Natural habitat: Inhabits lowland swamp forest.

Avoid forceful tankmates that outcompete it for food.

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Appearance and identification

Mature males have very long pelvic fins and black margins on the anal fin and lower tail.

Social behaviour and territory

May be kept in pairs or small groups in 80×30 cm; provide cover.

Diet and feeding

Try suitably sized dry food, alternating with live or frozen foods such as Daphnia and brine shrimp. Feed small portions and avoid overfeeding.

Sources