Forktail blue-eye

The home of the Pseudomugil furcatus is the fast flowing streams of Papua New Guinea. It is a peaceful schooling fish with a very beautiful shape and coloration and a striking courtship behavior. The keeping is problem-free.

What are the characteristics of the fork tail blue eye?

The freshwater fish is an agile water dweller. Apart from its optical beauty, it is characterized above all by its courtship behavior.
If a male wants to reproduce, he selects a female and drives her for a while. If the chosen one puts up with this, he starts his display behaviour and puts up the beautiful dorsal and anal fins.

The appearance of fork tail blue eye

Gabelschwanz Blauauge
Dirk Godlinski, Pseudomugil furcatus m Aquarium DG, CC BY-SA 3.0

The unique characteristics of this ornamental fish are its large blue eyes and the yellowish transparent body colouring.

The chest is yellow-orange in colour. The body fins are yellow.

The caudal fin is yellow and strikingly forked, but with black stripes on the edge.

The elongated body of the fish is also conspicuous.

The ideal aquarium for the forked tail blue eye

Since these are swimming-joyful and group-dynamic swarm fish, the blue-eyes need an aquarium tank with a minimum length of 60 cm. A noticeable water current must also be provided.

A dense planting with fine-grained plants and javamoos tufts offer the animals sufficient retreat possibilities. Furthermore, the permanent spawners like to lay their eggs in the plants and mosses. Nevertheless, sufficient free swimming space must be ensured. The substrate can be coated with sand, gravel or pure rock.

The socialisation succeeds with fish of the same origin. These include other blue-eye species or small rainbow fish. Livebearers are to be avoided, as they are larger and can also be strenuous, e.g. when feeding.

The number of blue-eyes in a shoal should be about six to ten specimens. The number of females should count much more. The reason for this is the aggressive behaviour of the males towards the females during the spawning season.

Sex differences

The different sexes of the fork tail blue-eye show distinctive sex characteristics. The male fish reach a body length of 5 to 6 cm, whereas the females remain considerably smaller.

From the age of half a year the colouring of the males can become even stronger. In addition the dorsal fin lengthens slightly.

Water values for the fork tail Blue eye

  • Temperature: 24 to 27° C / ideal are from 23 to 26° C
  • pH value: 7,0 to 8,0
  • Carbonate: 8° dKH
  • Total hardness: 5 to 15° dGH

Blue eyes react very sensitively to the slightest exposure to nitrite and nitrate. For a good water quality a regular Partial water change to be carried out. An efficient external filter is also an advantage.

Food and nutrition for the fork tail blue eye

Good water conditions as well as high-quality and varied feeding make the beautiful colours of the ornamental fish shine even brighter and promote the courtship display. The nutrition is omnivorous:

  • Small live food from Artemia nauplii, small water fleas and Cyclops ( for adult blue eyes )
  • Small grated frozen fodder and dry fodder

Fatty food and black mosquito larvae must not be fed, because the blue eyes can hardly tolerate them. Feeding should be made to measure and only every 2 days. In this way the animals remain slim and agile and the water is not too polluted.


The attitude-conditions of the fork tail Blauaugees are manageable

  • Spacious aquarium of at least 60 cm length
  • Group housing with at least 10 members. The number of female blue eyes must be predominant
  • The ideal water temperature is 23 to 26° C
  • Dense planting with slender plants and mosses
  • Live fodder suitable for mouthing, but also dried fodder

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