Mystus bimaculatus · Two Spot Mystus

Overview

A small peat-swamp catfish from Sumatra, Mystus bimaculatus is gentle even with very small companions. Keeping a small group encourages confidence, while dense cover and soft, acidic conditions reflect its natural setting.

Distribution & habitat

Restricted to Sumatra, Indonesia, it inhabits peat swamps. Human disturbance threatens these natural habitats.

Aquarium setup

Cover matters more than whether peat is used. Dense plants, wood, and rocks supply security, and floating growth diffuses light to encourage visible activity. Soft acidic water stained by tannins is preferable. Peat can be part of a habitat-style setup but is not essential for routine care.

Diet & feeding

Most small live, frozen, and dry foods are readily accepted. Rotate suitable foods to support condition and coloration.

Behaviour & compatibility

Peaceful small to medium tetras, dwarf cichlids, and anabantoids are potential companions. A small group of its own kind tends to be more relaxed and outgoing than a lone fish.

Sexual dimorphism

Adult females generally have a fuller belly. Males show a small genital papilla in front of the anal fin that resembles an isolated fin ray.

Breeding

Commercial production has relied on hormone injections, rather than demonstrating routine spontaneous aquarium spawning. A natural-breeding trial could use a species tank with very soft acidic water and peat substrate. Large daily changes with chemically matching but cooler water, once adults are conditioned, remain a proposed stimulus rather than a proven result.