All fish / Osphronemidae

Betta raja

Betta raja

Also known as raja betta, wild betta raja, red-tail betta raja, ベタ・ラジャ, cupang raja, 拉惹斗鱼

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A fairly large wild betta from the Betta unimaculata group, with a long, slim body in brownish tones, a reddish tail and blue-green sheen on the fins and gill covers. Enthusiasts keep it for its calm nature and as a less common wild species that does well in soft, tannin-stained water.

Care at a glance

Care level

Moderate

Temperament

Peaceful

Adult size

9 cm

Temperature

22 to 27 °C

pH

4.5 to 6.5

Smallest tank

60 litres

Keep as

A pair or small group in a well-planted tank

Diet

Carnivore: live and frozen bloodworm, daphnia, brine shrimp, mosquito larvae and small insects, with some quality granules

Swims

Middle of the tank

Lifespan

4 to 6 years

Water

Freshwater

Wild range

Indonesia: Sumatra (Jambi and Riau provinces)

Breeding

It is a paternal mouthbrooder: after spawning, the male carries the eggs and fry in his mouth for around two weeks. Breeding in captivity is achievable for experienced keepers who provide soft, acidic water, plenty of cover and minimal disturbance.

Good to know

It can jump, so a tight-fitting lid is essential. Fish sold under this name are often confused with Betta unimaculata or related mouthbrooders, so buy from collectors who give locality data.