Betta simplex
Kottelat 1994

Betta simplex
Photo by Kei Sasaki (Betta House) [5]

Keeping Betta picta from an Aquarist View


Betta simplex can be housed in pairs, species tanks, and community tanks.  Pairs can be housed in a 2.5 gallon tank, groups should be housed in a 10 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, simplex 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 a much darker stripe on the anal fin.  Females may not have a stripe or faint stripe on the anal fin.  Females ovaries might be visible via spotlighting.

Betta simplex male
Photo by Kei Sasaki (Betta House) [5]

Betta simplex female
Photo by Nonn Panitvong [3]


Simplex is a paternal mouthbrooder and the male incubates from 9 to 12 days with 10 days being very consistent.  Incubation time can vary with water temperature.  Females normally initiate spawning.

Similar Species Similar species would be picta complex members picta, falx and taeniata.
Identification Simplex males normally do not have a highly pronounced stripe in the caudal fin where as falx and simplex do.

Articles on Betta simplex

Mouth Brooder Betta of Thailand. Nonn Panitvong Thailand; c. 2002

Articles on related species

Betta picta: Not Very Beautiful, But Interesting NonethelessGerald Griffin, 1988 Republish from Flare Magazine

Betta picta (Sumatra)  Yohan Fernando

Betta picta – Carolyn Hanlon, 2007

Care and Breeding of Betta falx Gerald Griffin 2003, Republish from Flare Magazine

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

Working with wild Bettas Gerald Griffin.  Flare! 2006

Original Citation Kottelat, M. 1994. [54]
References Baensch, H.A. and R. Riehl, 1995. [26] Hilton-Taylor, C., 2000. [48] Panitvong, Nonn. [78] Pinto, Tony. 2002. [138]
Type Locality Spring (small lake) of Tham Sra Kaew and Nine Ponds, 2.2 km from National hwy 4034, nw. Krabi, Krabi Prov., Thailand.
Holotype ZRC 38486 [ex CMK 10635]
Paratype CMK 9445 (4)
ZRC 35168-69 (2)
Where Found Countries: Thailand
Miscellaneous Information Max Size: 3.84 cm SL
pH range: 7.0
dH range: 11.0
Temperature range: 22 – 26°C
Conservation status: This species is on the IUCN Red List as Vulnerable (D2).
Etymology: From the Latin simplex meaning plain.