Forktail Blue Eye Rainbowfish (Pseudomugil furcatus) Fish Species Profile

The Forktail Blue-eye Rainbowfish is a small, hardy, adaptable and peaceful species and is easy to keep making them ideal for beginner aquarists as well as more advanced aquarists.

Their colours are beautiful and impressive, they display yellow pelvic fins, and the upper edge of the pectoral fins is also yellow. The caudal fin has thin black upper and lower edges.

The Forktail Blue-eye displays a grey-greenish body, yellow pelvic fins, and the upper edge of the pectoral fins is also yellow. The caudal fin has thin black upper and lower edges.

Scientific NamePseudomugil furcatus
Other NamesForktailed Rainbowfish, Blue Eye Forktail Rainbowfish
OriginsEastern Papua New Guinea
Aquarium LevelMiddle
Best kept asGroups 5+
Lifespanup to 3 year
Maximum Sizeup to 5.5 cm
Water Conditions
Water TypeFreshwater
Temperature75 - 79 ℉ (23.9 - 26.1 ℃)
PH6.0 - 8.0
GH8 - 18
KH5 - 12


The Forktail Blue-eye Rainbow Fish lives in lowland slow-moving streams in the Eastern part of Papua New Guinea. You can find these fishes from Collingwood Bay to Dyke Ackland Bay. It seems to prefer clear and densely grown rainforest streams, with a dark, fine, sandy or rocky substrate.


These Rainbowfish are easy to feed and have no special requirements when it comes to what they eat.

Provide them with a varied diet of micro pellets, flakes and granules as well as small frozen, live and freeze-dried foods such as baby brine shrimp, Cyclops and Daphnia.

Sexing the Forktail Blue Eye Rainbowfish

you can differentiate a female from a male quite easily. The males have brighter colouring and a more curved, more vivid and impressive fin shape than the females.

Breeding the Forktail Blue Eye Rainbowfish

The Forktail Blue-eye can be bred in groups or pairs. They will generally become sexually mature when they are around 3-4 months old.

A densely planted aquarium of java moss or equivalent is advised for breeding purposes as it will make the fish feel more comfortable.

The male will display a show by swimming back and forth in the aquarium while keeping his anal, dorsal and pelvic fins in an erect position.

He can be a little pushy towards the female, but if he becomes aggressive, you should separate them because they are more than likely not compatible, and the female may get hurt if she is made to stay with him.

You maybe interested in the following profiles

Read More
Dwarf Neon Rainbowfish
Read More
Bloodfin Tetra
Read More
Cardinal Sulawesi Shrimp
Read More
Yellow Tiger Endler
Read More
Gold Barb
Date Added: 8/13/2020 - Updated: 8/13/2020 4:29:23 PM