Spotted blue-eye

Aquarium fish: Spotted blue-eye (Pseudomugil gertrudae)
Size: 3 – 4 cm
Origin: New Guinea
Water temperature: 21-28 ° C
Aquarium volume: 40 l

Spotted blue-eye (Pseudomugil gertrudae) – interestingly colored, one of the smallest representatives of the rainbow family.


Australia and New Guinea . A wide-ranging species, it mainly inhabits smaller rivers and streams, but also marshes in northern Australia and southern New Guinea.

Characteristics and disposition

They reach a length of up to 4 cm. The fish have characteristically dark spotted fins.

Gender fairly easy to distinguish . Males are more bright and patterned, and their dorsal and ventral fins are more elongated and sharply pointed. Females are paler and smaller. Body color varies depending on the place of occurrence. There are several varieties of white, blue, and the most common yellow.

The original, blue iris of the eye also draws attention in these fish. Blue-eyed fish are shoal fish and should be kept in a group of min. 8-10 individuals . In larger quantities, they present themselves better and are bolder. Males in particular look effective competing with each other for the favor of females.

Nutrition and feeding

In nature, it feeds on zooplankton, pythoplankton and small invertebrates. Feed small or ground food in the aquarium. An ideal diet should consist of live foods such as Daphnia, Artemia and micro nematodes, but fish are also happy to eat small dry foods.


Gertrude’s blue eyes should be kept in an aquarium with dimensions of at least 45x30x30 cm, partially planted with plants and a large swimming area. They look most beautiful in a shaded tank with a dark, fine-grained substrate.

It is also advisable to add a few roots to give the aquarium a more natural look. Water should be well oxygenated with noticeable movement. It is not recommended to introduce this species to a newly established reservoir where biological processes are not yet stabilized. Fish are very sensitive to changes in water parameters. These gentle but skittish rainbows are not suitable for a social aquarium.

They are best kept in a species aquarium or with fish of similar size, disposition, and requirements. Shrimps of the genus Caridina and Neocaridina will also be a good companion for Modrooks.


Reproduction difficult. Species that scatter eggs and do not care for eggs or offspring. Adult fish eat eggs and fry as soon as possible.

Fish of the genus Pseudomugil live quite shortly and generally pass through only one breeding season and are sexually mature at about 12-18 months. Spawning in nature occurs at the beginning of the rainy season (October to December), when the water contains the most plants and food. A male on the same day may be a partner of several females. Females lay small amounts of eggs every day for several days. The roe grains are folded among dense vegetation to which they attach with sticky fibers.

Spawning takes place during the day, in the late morning hours or early noon, when the water temperature is between 24-28 ° C. In the aquarium, by increasing the temperature, we encourage the fish to breed. We can breed fish in a small group of one male and two or three females. For this you will need a separate tank with a small sponge filter and small-leaved plants or an artificial aquarium mop. We look after the aquarium every day and transfer each grain of roe that is noticed to a separate container.

A less productive but easier and less unreliable way will be to breed these rainbow fish in a large colony of adult individuals, fully mature and decorated aquarium. Fry in such conditions have a better chance of survival because they are not exposed to fluctuations in water parameters and have constant access to food. The hatching itself is often problematic , i.e. the larvae cannot get out of the egg shells. In this case, you can try to transfer the eggs to a small bottle filled with aquarium water and shake it vigorously.

The incubation period is about 10 days depending on the water temperature. For the first 5 days, the fry require micro-food feeding. After this time, he should be taking artemia, micro nematodes, etc., and good-quality powdered dry foods available in stores. We feed the young twice a day in small portions. Uneaten leftovers should be discarded.

Small regular water changes are also required.


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