
Source: Wikimedia Commons
Pseudomugil gertrudae
A tiny blue-eye with black spots over a translucent body and yellow-edged fins. Males display with their fins spread wide. It is timid, so a species tank or very peaceful small companions suit it best.
Pseudomugil gertrudae is a tiny blue-eye ranging from northern Australia through southern New Guinea to the Aru Islands. FishBase records a maximum of 3.8cm SL, pH 6.0, 5-12 dH and 25-30C, and notes it lives in small creeks, swampy marshes and heavily shaded pools. Seriously Fish gives 21-28C, pH 4.5-7.5, 5-12 dGH and a 45 x 30cm base, recommending groups of eight to ten or more. Peaceful but timid and easily outcompeted at feeding time, it is unsuited to a general community tank. Wild populations are largely isolated and show marked local differences in colour, size and fin shape, but almost all fish on sale come from a single commercially produced strain. It is an egg scatterer with no parental care, and spawning is more likely at the warmer end of its range. The IUCN rates it Least Concern and it is not covered by CITES.
Source: Wikipedia (CC BY-SA 4.0)
The Spotted Blue-eye grows to Up to 3.8cm SL.
The ideal temperature for the Spotted Blue-eye is 21〜28℃.
Origin
Northern Australia, southern New Guinea and the Aru Islands
Size
Up to 3.8cm SL
Temperature
21〜28℃
Sources: FishBase / Seriously Fish
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Accepted name: Pseudomugil gertrudae Weber, 1911
Authority databases: FishBase
Nomenclature follows global taxonomic authority databases.
Sources: CITES Appendices (species not listed) / IUCN Red List
Regulations may change. Always verify the latest information with the relevant authorities.
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Fine dried foods and live or frozen brine shrimp and daphnia
Seriously Fish suggests a 45 x 30cm base. Dense planting and floating plants to soften the light help it settle, and a lid is advisable because it jumps.
Seriously Fish gives 21-28C, pH 4.5-7.5 and 5-12 dGH, extending well into acidic water, while FishBase records pH 6.0, 5-12 dH and 25-30C in the wild. Soft, slightly acidic water, for example over peat, suits it well.
Peaceful but timid and easily outcompeted, so it is unsuited to a general community. A species tank, fish of comparable size and disposition, or Caridina and Neocaridina shrimp are the better options.
Its mouth is very small, so choose the finest dried foods. Live or frozen brine shrimp and daphnia improve colour and breeding condition. Feed small amounts several times a day.
An egg scatterer with no parental care that eats its own eggs and fry. Spawning is more likely towards the upper end of the temperature range, the female attaching a few eggs daily over several days. Moving the eggs to a separate container raises survival.
Peaceful but timid, and it will go hungry alongside faster fish. Groups of eight to ten or more settle it and bring out male display. It reacts badly to sudden changes in chemistry, so make small, frequent water changes in a small tank. The IUCN rates it Least Concern and it is not covered by CITES.
Intermediate. This is an intermediate-level species. Some prior experience and knowledge of environmental management are recommended.
The ideal temperature for Spotted Blue-eye is 21〜28℃. Avoid sudden temperature changes and maintain a stable environment.
Spotted Blue-eye typically reaches Up to 3.8cm SL as an adult. Size may vary depending on care conditions and individual genetics.
Spotted Blue-eye feeds on: Fine dried foods and live or frozen brine shrimp and daphnia. Aim for a balanced diet with appropriate feeding frequency.
The price of Spotted Blue-eye varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: September 16, 2026