Badis khwae

Overview

The western Thai badid Badis khwae resembles Badis ruber and Badis siamensis but lacks their rows of small dark flank spots. It suits a quiet, well-covered aquarium with clearly separated areas for rival males.

Distribution & habitat

It appears restricted to the Khwae Noi basin near the Myanmar border, chiefly in small tributary streams. Farther south, the Khwae Noi meets the Khwae Yai at Kanchanaburi to form the Mae Klong. Some upper collection sites lie near the headwaters of Myanmar's west-flowing Ataran.

Most sites are shallow forest streams with slow to moderate flow and either clear or turbid water. Clearer examples often have sand and patches of submerged vegetation. Fish mainly use margins and still pools. A separate population was found in a clear, cool reservoir with dense aquatic plants, showing that habitats are not uniform.

Aquarium setup

Place smooth stones, roots, and branches over sand or gravel, adding floating plants and leaves for shelter. Attached Microsorum, Taxiphyllum, and Anubias can be used but are optional.

Provide caves made from coconut shells or accessible clay pots. Spread them across the aquarium and break sight lines between males. Strong light and powerful filtration are unnecessary. This species favors somewhat warmer, steadier temperatures than many badids; broad seasonal cooling routines used for northern relatives should not be transferred automatically.

Diet & feeding

The genus feeds on small aquatic crustaceans, worms, insect larvae, and zooplankton. Dry foods may be rejected. Supply regular suitably sized live or frozen Artemia, Daphnia, and similar foods, confirming that deliberate feeders get their share.

Bloodworms and Tubifex are associated with obesity and health problems and are best omitted from the everyday diet.

Behaviour & compatibility

A species aquarium simplifies feeding and breeding care. It is not a shoaling fish. Use a pair or one male with several females in restricted space; multiple males need independent territories, caves, and visual barriers.

Community companions should be peaceful upper-water fishes that do not dominate feeding. Larger or busy species may intimidate it. Avoid similar territorial bottom dwellers in ordinary aquariums, and keep other Badis species separate because hybridization is possible. Ornamental shrimp and their young may be eaten.

Sexual dimorphism

Males are slimmer, become markedly more colorful during breeding, and show a white dorsal-fin edge.

Breeding

Members of the genus form temporary pairs and spawn in caves, with males providing care. A dedicated breeding setup favors fry survival. Condition adults with live and frozen foods and give each male its own cave.

Typical generic accounts describe stronger male colors and rivalry, sometimes mouth-locking while a female is drawn into the cave, followed by roughly 30–100 eggs. The female is then driven away and the male guards and fans the brood. Eggs hatch after about two to three days. Young become free-swimming around six to eight days old and may stay near the cave for another week.

Dispersing fry may be eaten by adults, including the father, making separation necessary. Microworms suit the initially inactive young; add Artemia nauplii once they swim actively in the water column.

Notes

The tail-peduncle blotch is smaller than in Badis ruber. In Badis siamensis it can be smaller still or absent. Combine that comparison with the absence of rows of dark flank spots in B. khwae rather than identifying it from blotch size alone.