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Care guide · Freshwater · fish

Pearl gourami

Trichopodus leerii

Pearl gourami (Trichopodus leerii)
Photo: NasserHalaweh · Source · CC BY-SA 4.0Resized and compressed; no cropping or colour changes.

The pearl gourami (Trichopodus leerii) combines a delicate pearly pattern with an unusually unhurried swimming style. Its long feelers and the warm throat colour of mature males make it an attractive centrepiece for a spacious planted aquarium. However, it needs more than whatever space happens to remain above a busy shoal. It must be able to eat, breathe air and retreat without harassment. During reproduction in particular, a quiet surface area becomes defended nesting territory. This guide explains how to choose a suitable group, arrange safe shelter and select companions that can live alongside this gourami outside the breeding period too.

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At a glance

Temperature
24–28 °C
pH
6.0–8.0
GH
5–19 °dGH
Aquarium length
At least 120 cm
Adult size
Approximately 12 cm
Group size
At least 3 individuals
Temperament
Peaceful, Territorial

About this species

The accepted name is Trichopodus leerii; older aquarium books often use Trichogaster leerii. Here both names refer to the same species in the Osphronemidae. Pale pearl-like spots cover the body and fins, with a dark horizontal stripe along the flank. Mature males generally develop a stronger orange to red throat and longer fin rays. Sexing young fish is less reliable: do not buy three small specimens assuming that they will automatically become a suitable combination.

Plan for a fish about 12 cm in total length. One specialist source gives the same figure as standard length, excluding the tail, so the measurements are not entirely equivalent. We retain the more generous aquarium recommendation and do not treat 12 cm as a firm growth limit. The long feelers are modified pelvic fins. A torn feeler or damaged fin is a reason to check furnishings and tankmates, rather than dismissing the fish as a less attractive colour form.

Natural habitat

The natural distribution includes parts of Thailand, the Malay Peninsula, Sumatra and Borneo. The species is recorded from vegetated swamps and quiet lowland waters. Dense growth and shaded areas provide cover. This helps explain why a bare, brightly lit tank with strong currents offers little of the security that allows this fish to behave normally.

Translate that habitat into useful structures: planted margins, wood interrupting sightlines and patches of floating vegetation. Leave open water as well. A natural-looking water colour cannot replace water-quality checks, and an ordinary maintenance tank does not need to copy an intensely acidic breeding setup. Ask about the origin and previous water conditions of fish offered for sale. Captive-bred and wild-caught specimens may have different acclimation histories; make that information part of the purchasing decision rather than assuming every specimen has identical needs.

Aquarium and layout

Plan around an aquarium at least 120 cm long. Some care sources suggest a shorter footprint; we follow FishBase's more spacious recommendation because of adult size and the room needed to retreat. This length does not automatically accommodate extra males or a crowded community. We do not give an exact minimum volume: width, furnishings, stocking and usable space must be considered together.

Create several sheltered areas that do not all end in the same corner. A subordinate fish must also reach the surface without passing the dominant individual. Leave an air gap beneath the cover and sufficient openings among floating plants. A lid must not obstruct access to air. Position the filter outlet to maintain filtration and water movement while preserving calm surface areas. Remove sharp decorations and check that long fins cannot become trapped. Cryptocoryne around the margins can provide cover, but low plants cannot replace taller visual barriers.

Water conditions

This guide uses 24–28 °C, pH 6–8 and GH 5–19 °dH. This is a cautious shared range from the species information consulted; other sources give broader limits. The endpoints are not values to alternate between each day. Choose stable, suitable conditions and assess every tankmate against that same chosen environment.

A labyrinth organ allows air breathing but offers no protection against dirty water. Regular surface visits may be normal; a sudden increase, rapid gill movements or lethargy warrants investigation. Measure temperature, ammonia/ammonium and nitrite, and check whether another fish is blocking access to quiet areas. Prepare replacement water appropriately and avoid large unexpected differences. Do not add salt or a pH-adjusting product merely because a fish is hiding. First establish whether water quality, social pressure or something else is responsible. Keeping a short record of observations helps distinguish persistent trouble from a single brief incident.

Behaviour and group size

A practical starting composition is one male with two females, following OATA's general gourami guidance. This is not a shoaling rule: three random fish do not automatically form a suitable group. Multiple males may defend territories, while a single female can receive all the attention of a male ready to breed. Continue watching actual behaviour and have a way to separate fish if one is persistently chased.

Quiet shoaling fish may fit under appropriate conditions. The linked harlequin rasbora needs its own complete group and sufficient open swimming space; their shared temperature range is 24–26 °C. Compare more than pH. Avoid fin-nippers, pushy food competitors and companions constantly entering the nest area. Small shrimp or fish fry are not guaranteed safe partners for a fish that eats animal prey. An individual permanently hiding behind the filter may be socially displaced even when no wounds are visible.

Feeding

Use a suitable complete food for omnivorous tropical fish as the staple, with particles that are readily swallowed. The natural diet includes many small invertebrates. Appropriate small animal foods provide variety, but dried water fleas alone are not a responsible complete menu. The product links therefore distinguish staple food from supplementary food.

Observe each individual during feeding. A quiet gourami may miss out when faster fish take everything. If necessary, distribute small portions between several calm locations and wait until shy individuals are feeding too. Do not keep adding food simply because one fish is absent: first find it and establish why it is not approaching. Remove surplus food and adjust quantities according to visible intake and body condition. The suggested products are not treatments and do not establish a universal daily dose for every aquarium. Food reaching the substrate unused is a reason to reconsider delivery, not proof that the fish need a larger ration.

Breeding

The male builds a bubble nest at the surface and guards the eggs. A separate breeding setup makes observation and protection of other fish easier. Arrange tiny first foods and a safe rearing space beforehand; waiting until fry appear is too late. Around the nest the father can become much more forceful than during routine care. Remove the female from the situation if she is driven away after spawning and has nowhere safe to stay.

In one documented breeding at 26 °C, larvae hatched after about 36 hours. Other observations differ; follow development rather than a fixed clock. Tiny free-swimming fry start with very fine live food, such as suitable infusoria. Larger particles and Artemia should follow only when ingestion can be confirmed. Protect the filter intake, change water carefully and watch for temperature differences. Plan when to separate the father as well: nest care is not a permanent guarantee that growing fry can remain safely with adult fish.

Sources & review

This care guide draws on several specialist sources and was last checked on .

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