The dwarf gourami (Trichopsis pumila, Arnold, 1936) is one of the most charming and delicate inhabitants of the home aquarium. These miniature labyrinth fish have earned their place in our tanks, and decades of collective experience have taught us how to keep them thriving. As the smallest representatives of the labyrinth fish family, their tiny size combined with a peaceful temperament makes them perfect candidates for planted nano tanks and species-only setups.
What truly sets this species apart is their remarkable ability to produce audible sounds—soft croaking, clicking, or chirping noises you can actually hear in a quiet room. This unique trait has earned Trichopsis pumila the common names “Dwarf Croaking Gourami” and “Sparkling Gourami” in English-language literature. In my experience, watching males “communicate” during territorial displays is genuinely captivating—these tiny fish have personality to spare.
Taxonomy
| Level | Name |
|---|---|
| Kingdom | Animalia |
| Phylum | Chordata |
| Class | Actinopterygii |
| Order | Anabantiformes |
| Family | Osphronemidae |
| Subfamily | Macropodusinae |
| Genus | Trichopsis |
| Species | Trichopsis pumila (Arnold, 1936) |
Natural Habitat
In the wild, dwarf gourami inhabit the Mekong River basin and adjacent waterways throughout Southeast Asia: Thailand, Laos, Vietnam, Cambodia, and peninsular Malaysia. They prefer shallow mountain streams, standing water bodies, rice paddies, peat swamps, and even roadside ditches with slow-moving or completely still water. These habitats feature densely vegetated areas where leaf litter creates soft, slightly acidic water—conditions worth replicating in the home aquarium.
Physical Description
Adult specimens typically reach 3–3.5 cm in length, rarely exceeding 4 cm—truly diminutive even by nano fish standards. The body is elongated and arrow-shaped, laterally compressed, and relatively shallow compared to the more deep-bodied moon gourami and similar species.
Base coloration ranges from olive to beige or grayish-brown. A dark stripe runs along the midline from head to tail, appearing either as a solid line or a series of small spots. Above it runs a white stripe, and above that, a broken brownish line. The flanks are covered with iridescent green spots that create the characteristic sparkling effect, especially under proper lighting.
The eyes are strikingly bright blue with an orange or reddish rim—a distinctive species marker. The belly shows a delicate pinkish or reddish tinge, particularly pronounced in males during spawning. Dorsal, anal, and caudal fins are edged with fine pink, bluish, or red borders and decorated with red spots. The first rays of the ventral fins are modified into long, thread-like feelers—a characteristic feature of all gouramis, used as tactile organs.
Sexual dimorphism: Males are somewhat larger, slimmer, and more intensely colored than females. Females have noticeably rounder bellies, especially when carrying eggs. Males possess more elongated dorsal fins. Sex can also be determined by the “backlight method”: males have a rounded internal cavity at the rear, while females show a triangular shape due to the ovaries.
Lifespan is approximately 3–4 years with proper care. Sexual maturity is reached at around 5 months.
Care Requirements
This species is considered relatively straightforward to keep, though it does require attention to water parameters and proper aquarium setup.
Water Parameters
| Parameter | Optimal Range |
|---|---|
| Temperature | 24–28 °C (75–82 °F) |
| 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 | subdued (0.3–0.5 W/L) |
| Minimum volume | 30 L for a group of 8–10 |
Tank Setup and Decor
For a group of 8–10 specimens, a tank of at least 30 liters is suitable. Choose an elongated, shallow setup: length no less than 40 cm, water column height around 20 cm. Thanks to their miniature size, you can even keep small groups in nano tanks of 10–15 liters.
Substrate should preferably be dark and fine-grained, well-mulmed—this gives the fish confidence and intensifies their coloration. Arrange driftwood and several hiding spots using large stones or unglazed clay pots on the bottom. Adding leaf litter (Indian almond, oak) recreates the natural environment and slightly acidifies the water.
Plant moderately dense thickets along the back and side walls using vallisneria (Vallisneria spiralis), water milfoil (Myriophyllum spp.), cryptocoryne (Cryptocoryne spp.), or narrow-leaf sword plants—this provides shy fish with a sense of security. Floating plants (riccia, water lettuce, frogbit) are essential for creating shaded areas and diffused lighting.
As with all labyrinth fish, cover the tank with a lid or glass, leaving a small gap for air access. It’s crucial that the air temperature above the water surface remains close to the water temperature—cold air is dangerous for the labyrinth organ.
Importantly, the labyrinth organ in Trichopsis pumila is less developed than in larger gouramis, and the species is an obligate air-breather—without surface access, the fish will suffocate. At the same time, the water must be well-oxygenated. Quality aeration is mandatory, but flow should be weak or absent—use sponge filters or regulate water output.
Diet
Dwarf gourami are undemanding eaters, but their small mouths require appropriately sized foods:
- Live and frozen: daphnia (Daphnia magna), small bloodworms (Chironomus spp.), cyclops (Cyclops spp.), brine shrimp (nauplii), fruit flies, microworms, infusoria
- Dry foods: quality micro-granules and flakes for small fish
- Feeding schedule: twice daily in small portions
In nature, these fish feed on tiny invertebrates and insects, so live food is especially important for maintaining vibrant coloration and stimulating spawning. In my experience, regular live food feeding makes the fish noticeably more active and willing to display natural behaviors.
Breeding
Breeding Trichopsis pumila is a fascinating process accessible even to beginner aquarists. A separate spawning tank of 20–30 liters is required.
Preparing Breeders
Two weeks before the intended spawning, separate the male and female and feed them heavily with live foods. Raise the water temperature in the spawning tank to 27–28 °C, lower the water level to 15 cm. Water should be soft and slightly acidic (pH 6.0–6.5). Install floating plants and broad-leaved plants (anubias, cryptocoryne) near the bottom.
Spawning Process
The male builds a bubble nest, though in this species the nest is often located not at the surface but near the bottom—under a broad plant leaf, beneath driftwood, or in a cave. The nest is typically small, about walnut-sized. After courtship (during which males are especially vocal with croaking and clicking sounds), the embrace follows: the female turns upside down, the male wraps around her body, fertilizing the eggs. Both parents collect eggs in their mouths and place them in the nest.
A clutch contains 50–200 eggs (typically 100–170). Eggs are released in batches of 10–15, and the process may repeat several times.
Fry Care
After spawning, remove the female: the male guards the nest and tends the eggs. Incubation at 27–28 °C takes approximately 36–48 hours. After another 2–3 days, fry begin free-swimming. At this point, remove the male as well.
Starter foods include infusoria (Paramecium spp.), rotifers, then brine shrimp nauplii and microworms. Fry are extremely small and require microscopic food in the early stages. Maintain high water quality with frequent small-volume changes.
Compatibility
Dwarf gourami are exemplary peaceful but timid fish. Due to their miniature size and shy nature, they’re not recommended for community tanks with large or boisterous species.
Good tankmates include other small, peaceful species:
- Zebra danios (Danio rerio)
- Neon tetras (Paracheirodon innesi)
- Cardinal tetras (Paracheirodon axelrodi)
- Cherry barbs (Puntius titteya)
- Rasboras (Boraras, Trigonostigma)
- Microrasboras (Microdevario)
- Small corydoras catfish
- Small loaches (Pangio, Petruichthys)
- Snails and shrimp (though fish may hunt very small shrimp)
From the labyrinth fish family, honey gouramis and thick-lipped gouramis make excellent companions.
Not recommended: keeping dwarf gourami with large, aggressive, or active fish (such as oscars, large barbs, cichlids like Cichlasoma sajica or Blood Parrot Cichlid) capable of nipping thread-like ventral fins or creating stressful conditions. Also avoid species prone to fin-nipping.
The best option is a species-only tank or companionship only with the most peaceful nano fish.
How Dwarf Gourami Produce Sounds
A unique feature of Trichopsis pumila is their ability to produce audible sounds. Sound is generated by specialized tendons of the pectoral fins that rapidly vibrate against fin rays, creating a series of clicks or crackling noises. Both sexes can “talk,” but males do so most frequently—during territorial disputes, courtship, and nest defense. Interestingly, in T. pumila only males produce sounds, whereas in related species (such as T. vittata) females also actively “respond.”
To hear the sounds clearly, sit quietly in front of the tank with dimmed lights and the filter turned off. Fish often fall silent when humans approach but resume their “conversation” after a minute or two.
Personal Experience
In my practice keeping Trichopsis pumila, I’ve found these fish reveal their character most vividly in species-only tanks with dense vegetation and soft, diffused lighting. Males perform beautiful ritualized “dances” before each other, spreading their fins and producing soft crackling sounds. When provided with optimal water parameters and varied live foods, the fish behave confidently, stop hiding, and display the full beauty of their coloration.
I recommend starting with a group of at least 6–8 individuals with a female bias (ratio of 1 male to 2–3 females). In such groups, fish feel more comfortable, males more actively display color and behavior, but aggression is distributed rather than concentrated on a single individual.
Pay special attention to water quality—the species is sensitive to sudden pH changes and organic buildup. Regular partial water changes (20–25% weekly) are mandatory.
Frequently Asked Questions
Can I keep a dwarf gourami alone?
No, this is a schooling species. In isolation, the fish becomes stressed, loses coloration, and becomes lethargic. Optimal group size is 6–10 individuals with a female majority (1 male per 2–3 females).
Why is my dwarf gourami making sounds?
Sounds (crackling or chirping) are normal behavior for this species. Fish “talk” during courtship, territorial encounters, and feeding. This is precisely why they’re called “croaking” or “sparkling” gouramis.
Is aeration needed if it’s a labyrinth fish?
Yes, absolutely. The labyrinth organ in Trichopsis pumila is significantly less developed than in larger gouramis. Dissolved oxygen in water is vital for this species. Additionally, the species is an obligate air-breather—without surface access, the fish will die.
How does dwarf gourami differ from croaking gourami?
Trichopsis pumila (dwarf) is smaller—up to 3.5–4 cm, while Trichopsis vittata (croaking) reaches 6–7 cm. Both species produce sounds, but croaking gourami is somewhat more aggressive and requires a larger tank. In T. pumila only males produce sounds; in T. vittata both sexes do.
How do I know when the female is ready to spawn?
A spawn-ready female becomes rounded in the belly, more active, and responds more readily to male courtship. The male at this time intensively builds a bubble nest and displays bright coloration.
Can I keep dwarf gourami with shrimp?
Generally yes, but with caution. Fish may hunt very small shrimp and their young. With adult neocaridina and amano shrimp, problems typically don’t arise, especially in densely planted tanks with hiding spots.
What’s the minimum tank size needed?
For a pair, 10–15 liters works, but for a comfortable group of 6–10 individuals, I recommend a minimum of 30 liters. Larger volume means more stable water parameters and less stress for the fish.
Article updated: 2026-07-21
