Betta raja

Tan & Ng 2005

Photo of raja male by Pam Kreider (Gemjunkie)

Keeping Betta raja from an Aquarist View


Betta raja can be housed in pairs, species tanks, and community tanks.  Pairs can be housed in a 10 gallon tank, groups should be housed in a 30 gallon tank or larger.  Pairs should be given cover such as caves and plants.  In a pair or species situation it is possible that fry could be discovered in the tanks.  For best results remove a brooding male.

Water Conditions

Not critical, raja is very tolerant of water chemistry and thrives in almost any type of water as long as it is clean and well filtered.  They should be kept at cool to mid 70s F.


Males have a broader head then females and have a caudal spike typical of pugnax complex and longer pelvic fins.  Females ovaries might be visible via spotlighting.


Raja is a paternal mouthbrooder and the male incubates from 12 to 18 days with 14 days being consistent. Incubation time can vary with water temperature.  Females normally initiate spawning.

Similar Species Similar species would be pugnax complex members.

Articles on Related Species

I’ve Got a New Mouthbrooding Betta – Now What?.  Michael Hellweg.  2003.

Working with wild Bettas  Gerald Griffin.   Flare! 2006.

Original Citation Tan & Ng 2005
References Raffles Bull. Zool.   123 Fig. 4
Type Locality Sungai Ayer Merah, feeder stream to Danau Souak Padang, ca. 15 mins. by boat upstream, 1°36’45.7″S, 103°27’00.0″E, Sumatra.
Holotype MZB 9315
Countries Sumatra
Miscellaneous Information Max Size:

pH range:
dH range
Temperature range:

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Last update:06/11/2018