Mahachai Betta

Geographic Origin and Biotope: Endemic to the Samut Sakhon province (central Thailand). Inhabits nipa palm swamps and brackish estuarine coastal zones. It is the only Betta species that naturally lives in moderately brackish waters.

Taxonomy and Morphology: Mahachai Betta (Betta mahachaiensis). Part of the splendens complex. Discovered and described very recently (2012). Morphologically similar to wild B. splendens but slightly more slender and with a unique iridescent coloration.

Social Behavior: Males are territorial and aggressive towards each other. It is recommended to keep a single male with one or two females, or in very large tanks with plenty of visual barriers. It is shy towards other species.

Coloration and Sexual Dimorphism: Metallic green-blue or emerald green coloration on a brownish-black background. The iridescent scales uniformly cover the body and fins. The caudal fin has a spade shape. Females are brownish with less marked iridescent scales.

Aquarium Setup: 60 cm (24 inches) tank. Setup with dense plants (that tolerate hard or slightly brackish water like Java ferns), woods and catappa leaves. Lid mandatory. It is not strictly necessary to add salt, but it can prevent diseases.

Diet and Feeding: Micro-predator. Feeds at the surface or mid-water on small insects and larvae. Accepts granular dry food, but the diet must be supplemented with live and frozen food (bloodworms, brine shrimp, daphnia) to stimulate colors.

Water Quality: Unlike other Bettas (lovers of soft and acidic waters), B. mahachaiensis thrives in neutral or slightly alkaline and hard waters, and tolerates or appreciates a slight addition of marine salt.

Compatibility and Tankmates: Not suitable for classic community aquariums, especially if very lively. Can cohabit with small peaceful and slow fish, such as Pangios or small rasboras. Categorically avoid keeping it with other Bettas or fin-nipping fish.

Aquarium Reproduction: Bubble nester. The male creates the nest often inside rolled leaves or under floating vegetation. During the embrace, the female releases the eggs; the male collects them and fiercely cares for them.

Risks and Diseases: Uncontrolled hybridization in captivity (often sold as "Alien Betta") is erasing the pure wild genetic line. In nature, its habitat (nipa swamps) is in very grave danger of destruction due to urbanization.