Description
The dwarf gourami (Trichogaster lalius) is a small labyrinth fish from South Asia, widely kept as a centerpiece in calm community aquariums. Males display intense blue and reddish bands, while females are usually smaller and have a much subtler silvery coloration.
Although generally peaceful with other species, it is not as hardy as many beginner fish. It needs stable water, gentle flow, dense planting, and tank mates that are neither aggressive nor prone to fin-nipping.
Before buying: megalocytivirus infections, commonly called dwarf gourami iridovirus (DGIV) in the aquarium trade, have been documented in this species. There is no proven specific antiviral treatment. Choose active specimens from a reputable supplier and quarantine them for at least four weeks. Loss of appetite, darkening or loss of color, skin lesions, and progressive weakness call for isolation and assessment by a fish-health professional.
Behavior
With other calm species, the dwarf gourami is usually peaceful. Avoid very fast, aggressive, or fin-nipping tank mates, which may intimidate it and outcompete it at feeding time.
Males are territorial toward one another. In small or medium community aquariums, the safest choice is a single male. A pair or a group containing several females should only be considered in a larger, densely planted tank with visual barriers, while monitoring females for persistent harassment.
Its long pelvic fins act as tactile organs used to explore objects and other inhabitants. During courtship, the male intensifies its coloration, spreads its fins, and guides the female toward the bubble nest.
Habitat
The dwarf gourami is native to Pakistan, India, and Bangladesh. It inhabits slow-moving streams, channels, lakes, and flooded rice fields, usually in densely vegetated areas with calm water.
As a labyrinth fish, it has a labyrinth organ that allows it to breathe atmospheric air. In the aquarium it needs unrestricted access to the surface and a lid that keeps the air above the water warm and humid, away from cold drafts.
It benefits from gentle flow, tall and floating plants, shelter, and shaded areas. Leave some open surface space so it can breathe and build a bubble nest.
Habitats
Details
🌊 Water parameters
🐠 Minimum tank size
Breeding
The male builds a bubble nest at the surface, usually beneath floating plants. During the spawning embrace, the fertilized eggs rise and the male collects them into the nest.
After spawning, remove the female if the male begins to harass her. The male guards the nest until the eggs hatch, usually after about 24–36 hours. Once the fry become free-swimming, the male should also be removed.
Initial foods must be very small—infusoria or a dedicated fry food—followed by newly hatched brine shrimp as the fry grow. Keep the breeding tank covered to maintain a warm, humid layer of air while the labyrinth organ develops.
Diet
It is omnivorous. A good-quality flake or micro-pellet, preferably floating or slow-sinking, can form the staple diet. Add variety with frozen or live foods such as brine shrimp, daphnia, and mosquito larvae, together with small amounts of plant-based food.
It is a deliberate feeder that usually eats in the middle and upper levels. Offer small portions once or twice a day and make sure it receives enough food when housed with faster species.
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Plan your next aquarium
Is this fish right for you? Plan a suitable aquarium before setting it up.