Fish
Pearl Gourami
Trichopodus leerii
Origin: Полуостров Малакка, Таиланд, Малайзия, Индонезия (Суматра, Калимантан, Борнео)
Also known as: Трихопод жемчужный, Лунный гурами
Fact sheet
- Size
- 12 cm
- Lifespan
- 5 years
- Minimum tank size
- 80 L
- Temperature
- 24–28 °C
- pH
- 6–8
- Temperament
- Peaceful
- Social behavior
- In pairs
- Swimming zone
- Middle, Top
- Diet
- Omnivore
Varieties
Overview
The Pearl Gourami (Trichopodus leerii) is one of the most elegant and visually captivating members of the family Osphronemidae, native to the coastal lowland peat swamps, slow-flowing blackwater rivers, and shallow vegetated wetlands of Southeast Asia—specifically Thailand, peninsular Malaysia, and the Indonesian islands of Sumatra and Borneo. First described by Dutch ichthyologist and colonial surgeon Pieter Bleeker in 1852, the species was named in honor of Lieutenant-Colonel J.M. van Leer, a Dutch military colleague who collected the type specimens in Sumatra. The IUCN lists the Pearl Gourami as Near Threatened on its Red List, primarily due to extensive habitat destruction from wetland drainage, peat swamp conversion to agriculture, and deforestation across Sumatra and Borneo—making well-maintained captive populations of increasing conservation relevance. Its peaceful temperament, wide tolerance for water conditions, and spectacularly beautiful pearl-spangled appearance have made it a perennial favorite in community planted aquariums worldwide for well over a century.
Appearance
Pearl Gouramis have an elongated, moderately laterally compressed body reaching approximately 12 cm (4.7 inches) in length, covered in a mosaic of small, bright pearlescent white spots set against a warm brownish-silver base color—the pattern that gives the species all of its common names (pearl gourami, mosaic gourami, lace gourami). A bold dark stripe runs horizontally from the tip of the snout through the eye and continues to the base of the caudal fin, creating a strong contrast against the pearl-spotted flanks; the stripe breaks up into irregular spots toward the tail. Sexual dimorphism is pronounced and unmistakable: males are more intensely colored overall, and develop vivid orange-red to scarlet coloration that intensifies across the throat, breast, and belly during courtship—a display that makes breeding males among the most stunning freshwater fish in the hobby. Females are more modestly colored, rounder and more convex in the lower belly (particularly when gravid), and lack the brilliant orange-red throat coloration. The pelvic fins are modified into long, highly sensitive thread-like filaments—a characteristic of the gourami group—which the fish trails ahead of it and uses to probe objects in its environment.
Care
Pearl Gouramis are widely regarded as one of the easiest gourami species to keep, and are often recommended as an excellent choice for hobbyists making their first foray into keeping labyrinth fish. A minimum aquarium length of 120 cm (approximately 200 liters / 55 gallons) is recommended to give these active mid-level and upper-level swimmers adequate space and to allow the establishment of stable male territories. Water parameters are highly forgiving compared to many tropical species: temperature 24–28°C (75–82°F), pH 5.5–7.5, and hardness 2–16 dGH—a wide range that accommodates most municipal tap water once appropriately conditioned. Dense planted margins and floating plants are strongly beneficial, providing visual cover, reducing surface light intensity (which these blackwater fish prefer), and providing natural spawning media. As labyrinth fish, Pearl Gouramis must have unobstructed access to the water surface at all times to breathe atmospheric air; if the surface is blocked or the air above it is too cool, the fish will suffer respiratory distress.
Feeding
Pearl Gouramis are omnivores in nature, feeding on small aquatic and terrestrial invertebrates, zooplankton, algae, and plant material in their shallow blackwater swamp habitats. In captivity, they are among the least fussy eaters of all gouramis and accept virtually all standard aquarium foods with enthusiasm, including high-quality flake food, micro and small pellets, and freeze-dried foods. They particularly relish live and frozen foods such as Daphnia, Artemia (brine shrimp), mosquito larvae, and Tubifex, which supplement the protein component of their diet and stimulate natural hunting behavior. A plant-based component in the diet—such as spirulina flakes, blanched spinach, or algae wafers—reflects their natural algae-browsing tendencies and is beneficial for long-term health and immune function. Feed small amounts twice daily, offering only what the fish will consume within a few minutes to prevent fouling the water; uneaten food is particularly problematic in planted aquariums with lower water flow.
Compatibility
Pearl Gouramis are among the most docile and community-compatible of all gourami species, making them excellent residents in a wide variety of planted community aquariums. They coexist peacefully with tetras, rasboras, danios, Corydoras, loaches, livebearers, small plecos, and most other non-aggressive community fish of similar or smaller size. Male Pearl Gouramis are only notably assertive toward each other, particularly in the presence of females or during breeding season when males are actively constructing bubble nests; in most community tanks it is ideal to keep a single male with two or more females, or to provide a large, heavily planted aquarium (150+ liters) where two males can establish non-overlapping territories. Large, aggressive, or highly active species that would harass or nip the Pearl Gourami's delicate thread-like pelvic fins must be avoided—Tiger Barbs and similar nippy species are incompatible. Their peaceful nature also makes them vulnerable to more assertive gouramis such as Three-spot Gouramis, which may bully Pearl Gouramis in a shared aquarium.
Breeding
Male Pearl Gouramis are bubble-nest builders: the male constructs an elaborate floating nest of saliva-coated air bubbles at the water surface, anchored among floating plants, and defends this nest territory aggressively from rival males and other fish. Spawning is preceded by an elegant and prolonged courtship display in which the male intensifies his orange-red coloration to a brilliant scarlet and curves his body alongside the female in a series of circling passes; spawning then occurs in a characteristic cichlid-like embrace near the surface where the female releases 200–500 buoyant eggs that float up into the bubble nest. After spawning, the female should be removed from the aquarium, as the male may become aggressive toward her while guarding the nest; the male alone tends the nest, repairing bubbles and retrieving any fallen eggs. Eggs hatch in approximately 24–30 hours at 26–28°C, and the larvae hang from the nest threads while absorbing their yolk sac; the fry become free-swimming after 3–4 days. First feeding requires very fine foods such as commercial liquid fry food, paramecia culture, or infusoria for the first 1–2 weeks, after which the growing fry accept newly hatched brine shrimp nauplii; daily partial water changes and careful maintenance of the air layer above the water (to keep it warm and humid for the developing labyrinth organ) are critical during the first few weeks of fry development.
Fun facts
Pearl Gouramis possess a labyrinth organ—an accessory breathing structure derived from modified gill tissue located in a chamber above the gills—that enables them to extract oxygen directly from atmospheric air at the water surface, an adaptation that allows survival in the oxygen-depleted, stagnant blackwater swamps of Southeast Asia. The Pearl Gourami's IUCN Near Threatened status makes it an unusually significant case where a common, widely kept aquarium fish is actually threatened in the wild: healthy captive populations potentially represent a genetic reservoir of a species facing real-world population decline. The thread-like pelvic fins, common to many gourami species, are not merely decorative—they are densely innervated sensory organs that the fish actively uses to examine objects, substrate texture, and potential mates, functioning somewhat like external fingertips.