Croaking Gourami Care Guide

The croaking gourami is the sparkling gourami's bigger, tougher cousin: a small (~5-7 cm), hardy, planted-tank labyrinth fish that genuinely croaks. It is generally peaceful, but it is not a passive ornament - males stage audible croaking contests and turn territorial when breeding, so the stocking question is really about not crowding males of its own kind.

Croaking Gourami at a glance

The sourced figures the welfare engine uses to judge Croaking Gourami — the parseable key facts.

Where it comes from

Trichopsis vittata has a very wide range across Indochina - the lower Mekong basin in Laos, Cambodia and Vietnam, throughout southern Thailand, the lower Salween in Myanmar, Peninsular Malaysia and Singapore - and FishBase extends the trade range to Sumatra, Borneo and Java. Its home is still to slow-moving lowland water: swamp forest, peat swamps, floodplains, river tributaries, irrigation canals, paddy fields and roadside ditches, typically warm, vegetation-choked, tannin-stained and low in oxygen. That biotope drives the care sheet. Sluggish, weedy water means gentle flow only and dense planting with floating cover as core welfare, both for security and to anchor the male's bubble nest; warm, oxygen-poor water means a labyrinth organ and a need for surface air; tannin-stained blackwater origins mean it shows its best colour, and is most likely to spawn, in soft, slightly acidic water; and its warm lowland home means a heater in most rooms. It is also a documented invader: established in south-Florida canals since the late 1970s and re-collected in the Loxahatchee National Wildlife Refuge in 2012, 2015 and 2019, so unwanted fish must never be released.

Did you know?

• It croaks with its fins, not its mouth: two enhanced pectoral-fin tendons are stretched and plucked over bony fin-ray elevations during rapid fin-beating, 'like guitar strings', producing double-pulsed bursts with main energy around 1-1.5 kHz.
• It has a left-handed and right-handed voice: in one study the right and left sonic organs produced acoustically different bursts in 17 of 19 fish - a new form of lateralised sound production in vocal fishes.
• It settles fights by talking: males stage ritualised croaking contests that communicate strength and status and often resolve disputes without physical combat.
• It can be silenced and heal: cutting the sonic tendons mutes the fish, but many recover the ability in roughly 30 days to three months as the tendons regenerate.
• Both sexes are vocal, and females even 'purr' during courtship, making this one of the few aquarium fish where both sexes are clearly acoustic.
• Small but tough enough to invade Florida - established in south-Florida canals and refuges since the 1970s, surviving brackish water to about 16-20 psu and cold snaps near 7.2 degC.
• IUCN lists it as Least Concern (assessed 2019).

Tank size — and why

A 10 gallon (about 40 L) tank is the widely-cited practical floor for a single fish or a pair - Seriously Fish gives a 60 x 30 x 30 cm footprint for a pair - while a group needs more. The reason is less swim volume than footprint: a heavily-planted, broken-sight-line layout, water stability, and room to defuse male territoriality. The welfare nuance is specific: a tank holding more than one male should be larger and heavily aquascaped so broken sight-lines let rival males hold separate territories. Prefer length over height, as this is a surface-oriented air-breather that also holds horizontal territory.

As a guide, a 20-gallon tank comfortably suits about 1 Croaking Gourami as a single-species display, leaving room for tankmates.

How big does it really get?

Full-grown Croaking Gourami reach about 7 cm (2.8 in) long, but they are usually sold at only about 2.5 cm (1 in) — a typical shop size (estimate). At full size, Croaking Gourami needs roughly a 15-gallon tank, about 51 cm long; a common 10-gallon starter kit is only about 51 cm.

Adult size is sourced; the shop size is a typical-juvenile estimate; tank length is approximate for a standard 15-gallon aquarium.

Water parameters in practice

Aim for 24-28 degC (tolerated from about 22 degC, with spawning encouraged near 28 degC). pH 6.0-7.5 is the practical comfort band; Seriously Fish records an acidic floor of 5.0 while the databases start at 6.0 and allow up to 8.0, so soft and slightly acidic simply brings the best colour and spawning behaviour. Hardness can run soft to moderately hard. The one parameter to respect above all is cleanliness: this species is notably intolerant of ammonia and nitrite, so it must never go into an immature tank. Its headline survival extremes - down to roughly 7.2 degC and brackish water to about 16-20 psu - are invasion biology, not husbandry targets; keep it warm and fresh.

Diet & feeding

An omnivore leaning carnivore (FishBase trophic level 3.4), feeding in the wild on zooplankton and insect larvae. In captivity give a quality small flake or granule staple plus regular live or frozen bloodworm, daphnia, brine shrimp (Artemia) and tubifex; it accepts dried foods and some green flake. Feed small amounts once or twice a day, only what is cleared in a couple of minutes. It is a relatively shy, deliberate feeder that fast tankmates can out-compete, so confirm it is actually eating, and use the thread-like pelvic 'feelers' it taste-tests with as a sign it is foraging confidently. Live and frozen foods strongly condition it for spawning.

Gear & setup

Provide a heater, a fully cycled tank and gentle sponge or baffled filtration, because strong current exhausts this weak swimmer and discourages bubble-nesting. Plant densely with floating plants, add leaf litter or botanicals and fine-leaved cover, and use a dark substrate with tannin-stained water to suit the blackwater biotope and break sight-lines between males. Keep the tank covered with a warm, humid air gap below the lid and do not fill to the brim: the labyrinth organ requires surface air, a cold dry air layer can chill it, and small gouramis jump.

Temperament & behaviour

Generally peaceful and somewhat shy - Seriously Fish calls it 'peaceful unless breeding' - and a good community fish in a calm, planted tank, but males are mildly territorial. The defining behaviour is the croaking contest: rival males establish a dominance hierarchy largely by circling head-to-tail, flaring fins and producing sound for minutes to hours, which usually conveys respective strength and status before any physical fighting. Real fights do occur, especially in breeding condition or when males are crowded, and biting can even damage the sonic tendons. In a too-small, bare or bright tank, or with rowdy tankmates, it hides, stops displaying and fights more; cover, gentle flow, dim tannin-stained water and calm company bring out its natural displaying and croaking.

Group & social needs

Flexible and not a schooling fish. It can be kept singly, as a pair, or in a group - but a group should have only one male, or a large, heavily-aquascaped tank that breaks sight-lines so several males can each hold a territory. Females tolerate one another far better than males do, though even females may chase a rival near a nest.

Compatible tank mates (preview)

A short, engine-cleared shortlist — the species TankStocking's welfare engine clears with Croaking Gourami and that suit its size and temperament best. Tap any to load the pairing in the planner.

• Amano Shrimp — Peaceful temperament, similar adult size.
• Bamboo Shrimp (Wood/Fan Shrimp) — Peaceful temperament, similar adult size.
• Black Neon Tetra — Peaceful temperament, similar adult size.

A note on the shrimp and snails here: Croaking Gourami is peaceful and generally invertebrate-safe — but almost any fish will take very small shrimplets given the chance, so give shrimp dense cover (moss, leaf litter) if you want a colony to grow, rather than expecting every baby to survive.

This engine-cleared shortlist is Croaking Gourami's tankmate surface for now — a dedicated tank-mates guide can follow for high-demand species.

Breeding & sexing

Sexing is genuinely difficult: males tend to be slightly larger with more extended, pointed dorsal and anal fins and more intense fin colour, and a ripe female shows her ovaries as a paler patch when strongly backlit. Sound does not sex a fish, because both sexes croak and females even 'purr' during courtship. It is a bubble-nester (difficulty intermediate): the male builds a nest under a broad leaf, at the surface or among floating plants, the pair embraces beneath it releasing roughly five to ten eggs at a time, and the male tends the nest. Trigger spawning with warmth near 28 degC, soft slightly-acidic water, low flow and dense floating cover. Fecundity estimates vary widely, from 1 to over 200 eggs depending on the female. Eggs hatch within about 48 hours, fry are free-swimming after three to four days, and first foods are infusoria or liquid fry food then baby brine shrimp under a tight, warm lid; remove the female if she is harassed and the male once the fry swim free.

Lifespan

A realistically well-kept croaking gourami lives about 3-5 years, with roughly 2 years common in cold, dirty or over-stressed tanks and 5 years as a good-care best case; FishBase carries no maximum-age field, so the figure is husbandry-derived. What shortens it is chronic cold, ammonia or nitrite in an under-cycled tank, and the chronic stress of multiple males fighting in cramped quarters.

Common mistakes

• Crowding several males into a small tank - the number-one species-specific mistake. Males hold territories and stage croaking contests and fights, especially when breeding, so keep one male per small tank or give a large, densely-planted footprint with broken sight-lines.
• Treating 'peaceful' as 'passive'. It is community-safe with calm fish but not docile among its own males.
• Confusing it with the sparkling/pygmy gourami (T. pumila). They share overlapping 'croaking/sparkling' trade names, but vittata grows to roughly 6-8 cm versus pumila's ~4 cm, with different stocking implications - verify the species.
• Adding it to an uncycled tank. It is intolerant of ammonia and nitrite, a common killer of new croaking gouramis.
• A bare, brightly-lit, high-flow tank, when this shy blackwater fish needs cover, floating plants, dim or tannin-stained water and gentle flow.
• Treating it as cold-tolerant. It survives down to about 7.2 degC in invasion studies, but that is a lethal limit, not a target - keep it at 24-28 degC.
• Filling the tank to the brim or leaving no lid gap, when it needs surface air access and a warm humid air layer.
• Releasing unwanted fish into the wild - it is an established non-native in Florida.

Signs of trouble

• Clamped fins and faded colour or stripes.
• Hiding and refusing food.
• Lethargy and gasping.
• For males, a sudden loss of croaking or displaying - it can flag injury (including damaged sonic tendons), illness or being out-ranked.
• White spots, velvet or fungal film - usually triggered by cold, poor water or stress.

Is this fish right for you?

Don't buy this fish if you can't provide a heated, cycled, planted, low-flow tank of around 10 gallons or more with calm tankmates, if you want several males in a small tank, or if you can't tell it apart from a sparkling gourami at the shop. It is hardy and not tied to the dwarf gourami's inbred-line iridovirus problem, which is a genuine plus. One ethical point matters: because it is an established non-native in Florida and reported elsewhere, never release unwanted fish into the wild - rehome them instead.

Common questions

Why do croaking gouramis croak?

Mostly to settle male disputes. Rival males circle, flare their fins and produce sound - made by plucking two pectoral-fin tendons, not the mouth - in ritualised contests that signal strength and often resolve fights without biting. Both sexes also croak during courtship.

Are croaking gouramis aggressive? Can I keep two males?

They are generally peaceful but males are territorial, especially when breeding. Keep one male per small tank; only attempt several males in a large, heavily-planted tank with broken sight-lines so each can hold a separate territory.

How big do croaking gouramis get, and how do they differ from sparkling gouramis?

About 5-7 cm (large males to ~8 cm), roughly 1.5-2 times the length of the sparkling/pygmy gourami (T. pumila, ~4 cm). The croaking gourami is more robustly striped; the sparkling is tiny and neon-spangled. Both croak.

What can live with a croaking gourami?

Small peaceful tankmates: harlequin and chili rasboras, ember and neon tetras, calm danios, corydoras and other peaceful catfish, kuhli loaches, otocinclus, small rainbowfish and snails. Avoid fin-nippers, boisterous fish, male bettas, large or aggressive fish, and tiny shrimp or fry, which it will eat.

Are croaking gouramis hardy and beginner-friendly?

Yes, they are one of the tougher small gouramis - tolerant enough to colonise Florida canals - provided you cycle the tank fully (they are sensitive to ammonia and nitrite) and follow the one-male-per-small-tank rule.

Sources & confidence

Sources & confidence (9 species)

These back the Croaking Gourami figures and the previewed tank mates above. Each figure is read from the TankStocking species database (v2026.06); below is the care reference behind it and how confident we are in that data. Confidence reflects the source quality, not whether any pairing is safe. Full source list and the welfare model are on the methodology page.

• Croaking Gourami Trichopsis vittata — Seriously Fish (seriouslyfish.com/species/trichopsis-vittata) high confidence
• Amano Shrimp Caridina multidentata — Aquarium Co-Op amano shrimp care; Aquadiction high confidence
• Bamboo Shrimp (Wood/Fan Shrimp) Atyopsis moluccensis — Aquariadise (aquariadise.com/caresheet-bamboo-shrimp-atyopsis-moluccensis) high confidence
• Black Neon Tetra Hyphessobrycon herbertaxelrodi — Seriously Fish / Aqua-Fish (Hyphessobrycon herbertaxelrodi) high confidence
• Black Phantom Tetra Hyphessobrycon megalopterus — Seriously Fish (Hyphessobrycon megalopterus) high confidence
• Boesemani Rainbowfish Melanotaenia boesemani — Seriously Fish; Aquarium Co-Op Boesemani guide high confidence
• Bolivian Ram Mikrogeophagus altispinosus — Seriously Fish (seriouslyfish.com/species/mikrogeophagus-altispinosus) high confidence
• Brilliant Rasbora Rasbora einthovenii — Seriously Fish (seriouslyfish.com/species/rasbora-einthovenii) high confidence
• Bristlenose Pleco Ancistrus sp. — Aquarium Source / aqua-fish.net Ancistrus care guides high confidence

Care-guide sources (9)

This guide synthesises the references below; where they disagree, the range and the disagreement are noted in the text above. The figures in the key-facts box are read from the TankStocking species database (v2026.06). Full welfare model on the methodology page.

• Seriously Fish - Trichopsis vittata (Croaking gourami) — authority (Cuvier 1831), synonyms, distribution, habitat, max 60-70 mm, 60x30x30 cm for a pair, temp 22-28 degC, pH 5.0-7.5, hardness 18-268 ppm, 'peaceful unless breeding', bubble-nester 1-200 eggs, female 'purring', backlit-ovary sexing
• FishBase - Trichopsis vittata — range incl. Sumatra/Borneo/Java, max 8.0 cm TL / common 3.9 cm, temp 22-28 degC, pH 6.0-8.0, dH 5-19, trophic level 3.4, IUCN Least Concern (2019)
• USGS NAS - Croaking Gourami fact sheet — Florida introduction (late 1970s; Loxahatchee NWR 2012/2015/2019), size 4-7 cm SL, maturity 3-4 cm, lower lethal ~7.2 degC, brackish tolerance
• Small but tough: ecophysiology and invasiveness of the croaking gourami (NeoBiota) — peer-reviewed: survives acute salinity to 16 psu, up to 20 psu raised slowly, mean temperature at death ~7.2 degC
• Wikipedia - Croaking gourami — size ~5 cm to 6-7 cm, labyrinth organ, bubble-nest breeding (~5-10 eggs/embrace, ~100 total, some >200), croaking via pectoral fins, Florida establishment
• fishkeeper.co.uk - Croaking Gourami — max 7 cm, temp 22-28 degC, pH 6.0-8.0, dH 5-20, peaceful/shy, males may quarrel when breeding, tankmates, diet, sexing
• Maiditsch & Ladich - lateralised sound from left and right pectoral fins (PMC) — peer-reviewed sonic mechanism (two pectoral tendons plucked over bony elevations, main energy >1 kHz, double-pulsed bursts), lateralised sound in 17/19 individuals, agonistic display function
• SeaFishPool - Croaking Gourami care — lifespan ~2-5 yr, 40 L / 10 US gal minimum, ~26 degC optimum, croaking for breeding and male dominance, ~100 eggs near 28 degC, intolerant of ammonia/nitrite
• Ladich - muting/recovery and temperature effects on croaking-gourami sound (ScienceDirect) — peer-reviewed: croaking central to ritualised male contests; muting by cutting sonic tendons with recovery in ~30 days to 3 months

More on Croaking Gourami

Related guides on TankStocking — each scored by the same welfare engine as the planner.

This care guide is a sourced planning reference, not veterinary advice — individual fish, filtration and maintenance all matter. Cycle the tank, test your water, and observe your fish. How TankStocking works →