Betta mahachaiensis

Betta mahachaiensis is a wild bubblenesting betta found in coastal areas of Samut Sakhon Province, near Bangkok, Thailand. It is uniquely adapted to brackish water environments in Nipa palm swamps and coastal ditches, a habitat type unlike the soft blackwater preferred by most wild Betta species. Males display superb metallic green and blue iridescence.

In the aquarium, B. mahachaiensis tolerates and even benefits from a small amount of aquarium salt (1–2 g/L). It is otherwise maintained similarly to B. splendens. The species is a paternal bubblenester and males are aggressive toward each other. Their striking colouration rivals many domesticated varieties.

This species is considered Near Threatened due to rapid coastal development around Bangkok. Aquarium-raised specimens are available and their maintenance in captivity contributes to conservation awareness. Breeding is straightforward for anyone experienced with common bettas.