Dwarf Croaking Gourami (Trichopsis pumilus): Complete Care Guide
The dwarf croaking gourami (Trichopsis pumilus, Arnold, 1936) is one of the most charming and peaceful nano fish available to hobbyists. Despite its small size — adults rarely exceed 3.5–4 cm (about 1.5 inches) — this species has a big personality. It is famous for producing audible croaking or clicking sounds, especially during courtship and territorial displays, which is why it earned its common name. In our editorial team’s experience keeping this species, these soft sounds in a quiet room never fail to impress visitors.
If you are looking for a gentle, community-friendly labyrinth fish that fits perfectly into a planted nano tank, Trichopsis pumilus is an excellent choice.
Classification
| Level | Name |
|---|---|
| Kingdom | Animalia |
| Phylum | Chordata |
| Class | Actinopterygii |
| Order | Perciformes |
| Suborder | Anabantoidei |
| Family | Osphronemidae |
| Genus | Trichopsis |
| Species | Trichopsis pumilus (Arnold, 1936) |
Natural Habitat
In the wild, the dwarf croaking gourami inhabits shallow streams, rice paddies, and slow-moving ditches across Southeast Asia — primarily Thailand, Vietnam, and Cambodia. It prefers heavily vegetated areas with soft, slightly acidic water darkened by leaf litter. Replicating these conditions in the aquarium will bring out the best colouration and behaviour.
Dwarf Croaking Gourami: Appearance and Sexual Dimorphism
The body is elongated, laterally compressed and relatively slender compared to other gourami species. The base colour is olive to brownish-grey, with a dark lateral stripe composed of small spots running from the snout to the tail. The eyes and belly carry a soft pinkish or reddish hue. The dorsal, anal, and caudal fins display a delicate pink or bluish fringe. The first rays of the ventral fins are modified into long filaments — a hallmark of all gourami species.
Sexual differences: Males are slightly larger, slimmer, and more vibrantly coloured. Females are rounder in the belly, especially when gravid.
Lifespan: approximately 3 years under good conditions. Sexual maturity is reached at around 5 months of age.
Dwarf Croaking Gourami: Tank Requirements and Water Parameters
Water Parameters Table
| Parameter | Recommended Value |
|---|---|
| Temperature | 24–28 °C (75–82 °F) |
| General Hardness (GH) | 5–15 °dH |
| pH | 6.0–7.5 |
| Ammonia / Ammonium | 0 mg/l |
| Nitrite | 0 mg/l |
| Nitrate | up to 20 mg/l |
| Lighting | 0.3–0.5 W/l (fluorescent) |
| Minimum Volume | 30 l for a group of 8–10 fish |
Tank Setup
A group of 8–10 individuals requires a tank of at least 30 litres (approximately 8 US gallons). An elongated, shallow tank works best — aim for a length of at least 40 cm and a water depth of around 20 cm. A dark, fine-grained substrate, ideally well-seeded with beneficial bacteria, makes these shy fish feel secure and enhances their natural colours.
Add driftwood, clay caves (unused ceramic pots work well), and dense plantings of Vallisneria spiralis, Myriophyllum spp., or Echinodorus angustifolius ‘Vesuvius’ along the back and sides. These hiding spots are essential for a species that tends to be somewhat timid.
Like all labyrinth fish, Trichopsis pumilus must have a covered tank to prevent cold air from reaching the labyrinth organ. However, its labyrinth is less developed than that of larger species such as the marble gourami, so good water oxygenation is critical. Choosing the right aquarium compressor/air pump will help you maintain optimal dissolved oxygen levels. A gentle internal or external filter is also recommended to keep the water clean without creating strong currents.
Feeding
The species is not fussy about food, but its small mouth requires appropriately sized items:
– Live / frozen: daphnia (Daphnia magna), small bloodworm (Chironomus spp.), cyclops (Cyclops spp.), baby brine shrimp (Artemia nauplii);
– Dry food: high-quality micro-pellets and fine flakes formulated for small fish;
– Frequency: 2 small feedings per day.
Dwarf Croaking Gourami: Breeding
Breeding Trichopsis pumilus is rewarding and accessible even for beginners. A separate breeding tank of 20–30 litres is recommended.
Conditioning. Two weeks before the planned spawn, separate male and female and feed them generously on live foods. Raise the breeding tank temperature to 27–28 °C.
Spawning. The male builds a bubble nest at the surface, often incorporating plant fragments. During elaborate courtship displays — accompanied by audible croaking — the pair embrace: the female turns belly-up, the male fertilises the eggs, and then places them in the nest. A typical clutch contains 50–200 eggs.
Fry care. Remove the female after spawning; the male guards the nest and tends to the eggs. Incubation at 27–28 °C takes approximately 36–48 hours. Free-swimming fry appear 3–4 days later. At this point, remove the male as well. First foods: infusoria (Paramecium spp.), micro-worms, and baby brine shrimp nauplii.
Compatibility
The dwarf croaking gourami is an exemplary peaceful species. Suitable tank mates include small, calm fish such as danios (Danio rerio), neon tetras (Paracheirodon innesi), cardinal tetras (Paracheirodon axelrodi), and cherry barbs (Puntius titteya). Fancy guppies (guppy care guide) and balloon mollies (balloon molly) with their flowing fins can also work well in a peaceful community, provided they are not nippy. Avoid large, aggressive, or hyperactive species that may outcompete or damage the delicate filamentous ventral fins of Trichopsis pumilus.
Authoritative Sources
- FishBase: Trichopsis pumilus — taxonomy and distribution data
- Seriously Fish: Trichopsis pumilus — detailed husbandry notes
FAQ: Dwarf Croaking Gourami
1. How many dwarf croaking gouramis should I keep together?
This is a shoaling species and should always be kept in groups of at least 6–8 individuals. A ratio of one male to two or three females reduces aggression. Solitary fish become stressed, pale, and lethargic.
2. Why does my dwarf croaking gourami make sounds?
The croaking or clicking sounds are produced by modified pectoral-fin tendons rubbing against the pectoral girdle. This is entirely normal behaviour, particularly during courtship and mild territorial disputes between males.
3. Do I need an air pump if my gourami is a labyrinth fish?
Yes. The labyrinth organ of Trichopsis pumilus is less developed than in many other labyrinth fish, making dissolved oxygen in the water particularly important. Good aeration and surface agitation are strongly recommended.
4. What is the difference between the dwarf croaking gourami and the croaking gourami?
Trichopsis pumilus (dwarf croaking gourami) reaches only 3.5–4 cm, while Trichopsis vittata (croaking gourami) grows to 6–7 cm and is somewhat more territorial. Both species produce sounds, but the dwarf is the more delicate and shy of the two.
5. My dwarf croaking gourami hides all the time — is something wrong?
Frequent hiding is normal for this naturally shy species, especially in a new tank or bright lighting. Ensure the tank has dense planting and subdued light. Once the fish settles in, it will become more visible and confident.
Last updated: July 08, 2026
