Dwarf gourami

Identity and search names

This profile applies to Trichogaster lalius. Confirm trade identity and preserve breeder, supplier or locality records where relevant.

Environment and housing

Warm, gently filtered, well-covered aquarium with floating plants, sheltered surface areas and warm humid air under a tight lid

Feeding and nutrition

Feeding ecology: Omnivore; small invertebrates, quality prepared foods and some plant material

Feeding routine: Offer small varied meals once or twice daily and avoid obesity

Breeding and reproduction

Male builds a bubble nest and gathers eggs beneath it

Parental care: Male guards eggs and larvae until the fry become free-swimming; remove the female if harassed

System demands

Filtration: Use mature biological filtration sized for the adult stock and feeding load, with guarded intakes and a flow pattern the species can use without continual effort.

Aeration: Maintain strong gas exchange and stable dissolved oxygen, especially overnight, during warm weather, medication, crowding or any interruption to filtration.

Maintenance: Test ammonia and nitrite after changes or abnormal behaviour; remove waste from the occupied zone and perform regular water changes matched to temperature and mineral chemistry.

Detailed husbandry

Identity scope

This profile applies to Trichogaster lalius. Confirm trade identity and preserve breeder, supplier or locality records where relevant.

Adult size and space

Up to about 9 cm total length. At least 90 L for one male; mixed-sex housing requires more space, dense cover and close aggression monitoring. Plan around adult dimensions, activity, group size, aggression and waste production rather than sale size.

Social structure

One male is the safest ordinary arrangement; a pair requires dense cover and an escape route for the female, while multiple males need a much larger system

Swimming zone

Primary zone: Upper and mid water. Keep that zone usable for movement, feeding and refuge.

Feeding ecology

Omnivore; small invertebrates, quality prepared foods and some plant material

Feeding plan

Offer small varied meals once or twice daily and avoid obesity

Water stability

Maintain 24–28 °C; pH 6.0–7.8; hardness/minerals: Soft to moderately hard. Stable oxygenation and nitrogen-cycle control matter more than chasing one exact number.

Habitat structure

Warm, gently filtered, well-covered aquarium with floating plants, sheltered surface areas and warm humid air under a tight lid

Compatibility plan

Calm community fish that do not nip fins or dominate the surface feeding zone

Breeding plan

Male builds a bubble nest and gathers eggs beneath it. Parental care: Male guards eggs and larvae until the fry become free-swimming; remove the female if harassed.

Quarantine

Quarantine new fish in a separate cycled aquarium with dedicated equipment. Match temperature and mineral chemistry gradually, confirm feeding and normal respiration, and never add transport water to the established aquarium.

Welfare checks

Maintain the stated adult space and social structure, verify feeding and intervene early when injury, exclusion, weight loss, abnormal respiration or altered behaviour appears. Dwarf gourami iridovirus and related megalocytiviruses have been documented through the ornamental trade. Infection is not inevitable, but sourcing, strict quarantine and rejection of lethargic, wasted, ulcerated or swollen fish are essential.

Biosecurity and release

Never release fish, fry, eggs, aquarium water, sediment, plants or live foods into drains, dams or natural waterways. Confirm current Australian import conditions and South Australian possession, trade and movement rules before acquisition or transfer.

Main risk

Dwarf gourami iridovirus and related megalocytiviruses have been documented through the ornamental trade. Infection is not inevitable, but sourcing, strict quarantine and rejection of lethargic, wasted, ulcerated or swollen fish are essential.

Adult Projected Load

Moderate because warm water, surface breathing, territorial males and rich feeding reduce the oxygen and disease-safety margin in small aquariums.

Filtration

Use mature mechanical and biological filtration with protected intakes and enough turnover for the adult group while preserving species-appropriate current and refuge.

Aeration

Provide strong gas exchange and backup aeration; increase oxygen support before warm weather, heavy feeding, crowding, medication or filter interruption reduces the safety margin.

Maintenance

Remove uneaten food and bottom waste, clean prefilters before flow falls, test ammonia and nitrite after changes, and perform regular temperature- and chemistry-matched water changes.

Overridable Warnings

Surface access, quarantine, disease signs, male aggression, warm-water oxygen and source quality cannot be overridden.

Welfare and risk

Maintain the stated adult space and social structure, verify feeding and intervene early when injury, exclusion, weight loss, abnormal respiration or altered behaviour appears. Dwarf gourami iridovirus and related megalocytiviruses have been documented through the ornamental trade. Infection is not inevitable, but sourcing, strict quarantine and rejection of lethargic, wasted, ulcerated or swollen fish are essential.

Sources

• Eschmeyer’s Catalog of Fishes — Trichogaster lalius — Accepted-name, synonym and taxonomic-placement cross-check
• PubMed — detection of dwarf gourami iridovirus — Documented megalocytivirus prevalence through the ornamental trade
• IUCN Red List search — Trichogaster lalius — Conservation-status and wild-provenance cross-check
• Australian Government — importing live ornamental fish — Australian import pathway and biosecurity requirements
• PIRSA — South Australian noxious fish list — South Australian possession, trade and release context
• Eschmeyer’s Catalog of Fishes current search — Trichogaster lalius — Current accepted-name, synonym, distribution and habitat cross-check