Badis assamensis

Overview

A comparatively large badid from northeastern India, Badis assamensis is deliberate and retiring. Active companions may monopolize its food, while rival males can defend space vigorously. A quiet aquarium with substantial cover suits these combined needs.

Distribution & habitat

The core records are from the Brahmaputra drainage in Assam. Occurrence in northern West Bengal near the Assam border is also possible. A replacement type specimen was designated from a Dibru tributary in Dibrugarh after the original material could not be located. Before the 1950 earthquake, the Dibru flowed into the Brahmaputra.

That collection site was a slow forest stream with trees reaching the bank and sometimes standing in the water. Brownish, nearly stagnant water covered sand and beds of waterlilies; another Badis species occurred there as well.

Aquarium setup

Combine sand or gravel with smooth stones, roots, branches, leaves, and floating cover to create sheltered areas. Attached Microsorum, Taxiphyllum, or Anubias are optional. Neither illumination nor filtration needs to be powerful.

Include caves, such as coconut shells or inverted clay pots with accessible openings. Distribute them around separate areas when keeping several males instead of concentrating every site together. Seasonal temperatures are part of its natural experience. Heating may be unnecessary where room conditions remain suitable, while a gentle increase within its normal range can encourage breeding. Brief tolerance of extremes should not define long-term care.

Diet & feeding

The genus feeds on small aquatic crustaceans, worms, insect larvae, and other zooplankton. Captive fish can be selective and may reject dry foods. Even fish that learn to accept them should receive regular live or frozen Artemia, Daphnia, or glassworms.

Watch slow feeders closely to ensure they actually obtain food. Bloodworms and Tubifex are associated with obesity and health problems in these fishes and are best excluded from the routine diet.

Behaviour & compatibility

Carefully selected peaceful upper-water companions can work. Avoid large, highly active, or strongly competitive feeders. Tiny fishes and freshwater shrimp, especially young shrimp, may be eaten. Similar-looking territorial bottom dwellers are unsuitable in ordinary-sized aquariums.

Do not mix different Badis species because hybridization is possible. This is not a shoaling fish. A pair or one male with several females is preferable in limited space; multiple males require separate territories and effective visual barriers.

Sexual dimorphism

Females are smaller, duller, and shorter-bodied with a rounder profile. Mature males are more elongated and develop slightly extended fins.

Breeding

The genus uses caves and temporary pair bonds. A dedicated breeding arrangement offers better fry survival than a community, and each male needs a cave. After conditioning with live and frozen foods, males intensify their colors, confront rivals, and may lock mouths while drawing females toward the cave.

Typical generic accounts describe batches of roughly 30–100 eggs. The male ejects the female, guards the brood, and fans water across it. Eggs hatch after about two to three days; young become free-swimming around six to eight days old and may remain near the cave for another week.

Once they disperse, adults including the father may eat them, making separation advisable. Initially sedentary fry can take microworms, followed by Artemia nauplii when they swim visibly in the water column. These are genus-level breeding observations, so progress should be judged from the actual brood.

Notes

The pattern is almost identical to that of Badis blosyrus, but this species is generally larger with a distinctly shorter jaw profile. Color photographs alone can be misleading. Historical classifications and species counts in the family have changed repeatedly; identity is better assessed from morphology and locality.