Betta simplex

14. November 2025

This small (5-6 cm) mouthbrooding species from Thailand is a very nice addition to the assortment of wild collected Betta we occasionally have in stock. Betta simplex is a close relative to the species Betta picta from Java, Betta falx from Sumatra, and Betta taeniata from Borneo. All the mentioned species share obviously the same ancestor. 

The males have a broad green to blue (reddish in B. falx) seam in the anal and the caudal fin, which is almost lacking in females.

Our B. simplex are young adults and particulary nice at that age. In contrast to many other mouthbrooding Betta species, B. simplex is not adopted to soft, acidic water, for the natural habitat (near the town of Krabi in the south of Thailand) is characterised by lime stone hills. Like in most species of mouthbrooding Betta the males are compartively peaceful against each other and one can keep usually several males together in the same tank without any problems. However, the aquarium should be well furnished and contain well growing plants.

For our customers: the fish have code 387752 on our stocklist. Please note that we exclusively supply the wholesale trade.

Text & photos: Frank Schäfer