Max Size: 3.5cm

Ivantsoffs Blue Eye Rainbowfish (Pseudomugil ivantsoffi)

Ivantsoff's Blue Eye Rainbowfish are peaceful, stunning and somewhat rare. These fish are also relatively hardy, making them suitable for beginner aquarists as well as ideal members of a species only nano aquarium or a well-planted community aquarium alongside other species similar in size and disposition.

Ivantsoff's Blue Eye Rainbowfish are schooling fish in nature and will exhibit their best colours when you keep them in a group of 6 or more individuals, including numerous males. However, you must maintain these fish in a heavily planted, spacious aquarium to ensure that dominant males do not overly harass subdominant males.

Ideal tankmates for Ivantsoff's Blue Eye Rainbowfish could include other smaller Rainbowfish species; however, avoid housing them with other Rainbowfish from the genus Pseudamugil otherwise, hybridisation may occur. Other possible tankmates can include other peaceful fish species of similar size, disposition, and water requirements, such as smaller Barbs, Gobies, Rasboras and Corydoras Catfish. It would be best to avoid maintaining them alongside much larger, more aggressive species; otherwise, they will become withdrawn and easily stressed.

It would be best if you kept Ivantsoff's Blue Eye Rainbowfish in an aquarium with a slow current as these fish originate from calmer waters. In addition, having a darker substrate would also benefit you as their colours will stand out more.

Ivantsoff's Blue Eye Rainbowfish have a semi-transparent head and body with a blueish or reddish hue, bright blue eyes and their operculum and swim bladder are silvery. In addition, the upper half of the first dorsal, as well as the anterior half of the second dorsal fins and the edge of the anal fin, are bright red.

The ventral and dorsal shapes posterior to the second dorsal and anal fins are also edged in red, as is the upper and lower third of the caudal fin. The pelvic fins are a pinkish colour, and the edges of some scales on the abdomen have narrow black margins.

Tank Mates for the Ivantsoffs Blue Eye Rainbowfish

10 ideal tank mate ideas for the Ivantsoffs Blue Eye Rainbowfish include:

Adolfos Catfish(Corydoras adolfoi)
Cherry Barb(Puntius titteya)
Chilli Rasbora(Boraras Brigittae)
Delphax Corydoras(Corydoras Delphax)
Dwarf Neon Rainbowfish(Melanotaenia praecox)
Dwarf Pencilfish(Nannostomus marginatus)
Dwarf Rasbora(Boraras maculatus)
Pentazona Barb(Desmopuntius Pentazona)
Phoenix Rasbora(Boraras Merah)
Purple Pencilfish(Nannostomus rubrocaudatus)
Quick Facts
Scientific NamePseudomugil ivantsoffi
Year Described1999
Other NamesIvantsoffi Rainbowfish
Aquarium LevelMiddle
DifficultyBeginner - Intermediate
Best kept asGroups 8+
Lifespan3 - 5 years
Water Parameters
Water TypeFreshwater
PH6.0 - 8.0
GH5 - 15
KH1 - 5
75 - 85℉
23.9 - 29.4℃

Photos of the Ivantsoffs Blue Eye Rainbowfish

Ivantsof's Blue-eye Rainbowfish
Ivantsof's Blue-eye Rainbowfish
Ivantsoff's Blue Eye Rainbowfish
Ivantsoff's Blue Eye Rainbowfish
Ivantsoff's Blue Eye Rainbowfish
Ivantsoff's Blue Eye Rainbowfish


Ivantsoff's Blue Eye Rainbowfish (Pseudomugil ivantsoffi) - Rare Rainbowfish Profile & Care Guide

Natural Habitat

Ivantsoff's Blue Eye Rainbowfish are endemic to the tributaries of the Ajkwa, Iwaka, Wataikwa and Kopi Rivers in the Timika-Tembagapura region of West Papua in Indonesia in Southeast Asia. These Rainbowfish inhabit small, shallow, slow-flowing rivers and streams in dense rainforests. The water in these habitats are generally clear; however, some are tannin-stained, with light aquatic vegetation. The substrates in these habitats include sand, gravel, rocks, and abundant dense vegetation.

Kopi River

What to feed the Ivantsoffs Blue Eye Rainbowfish

Ivantsoffi's Blue Eye Rainbowfish primarily eat zooplankton, phytoplankton, and invertebrates in the wild. However, in the aquarium, they fare best with a diet comprised of live and frozen food such as Moina, daphnia, Brine shrimp and microworm supplemented with high-quality, small, floating dried foods such as crushed flake or fine granules. It will help if you remember that these are very small fish with tiny mouths.

How to sex the Ivantsoffs Blue Eye Rainbowfish

It is pretty straightforward to differentiate between the male and female Ivantsoff's Blue Eye Rainbowfish. The males are generally slimmer and more vibrantly coloured, with their fins being a bright red colour, whereas the female's fins are translucent to faint yellow except for the edges of the first and second dorsal fins, which are yellow.

How to breed the Ivantsoffs Blue Eye Rainbowfish

Ivantsoff's Blue Eye Rainbowfish are egg layers that present no parental responsibility and will often gobble their eggs and fry if given the opportunity. However, in a well-decorated aquarium, some babies may survive.

Spawning will more likely take place with slightly higher temperatures. The females deposit a few eggs daily for several days, affixing them to aquatic vegetation or spawning mops. In addition. a single male may also breed with several females during a single day.

Spawning usually occurs during daylight hours, with a spurt of activity from late morning to early afternoon. Breeding can occur throughout the year in the aquarium if the temperature is kept the same.

You can use two methods to spawn these fish; the first involves separating a small group of 6 to 8 individuals or a single male and two or three females into a separate breeding tank with an air-powered sponge filter and a spawning medium such as nylon mops or aquatic moss. You will need to check this daily, and if you find any eggs, you will need to move them into a separate rearing tank for incubation and hatching.

The second method would be to maintain a colony of adults in a more comprehensive, fully-decorated setup that should allow some babies to survive if well-planted. However, the babies initially spend most of their time close to the water's surface. Therefore, it would be best to affix aquatic mosses to decor high up in the aquarium or use floating plants with long roots to produce the most favourable results.

The second method is usually less practical but more straightforward and reliable as established, and planted aquariums facilitate stable water conditions. In addition, the microfauna that has grown in the aquarium can create a beneficial early food source for the fish fry.

The incubation period for these Rainbowfish is usually between 7 and 15 days, depending on temperature. After that, the babies can accept baby brine shrimp and microworm immediately. You can also raise them on good quality, powdered dry products.

It would be best to offer the babies small meals at least twice a day, and then any uneaten food will need to be removed immediately and should not be allowed to accumulate in the rearing tank. If you do not remove the uneaten food, this can lead to a high mortality rate; therefore, small regular water changes are essential.

Other Rainbowfish of interest

Banded Rainbowfish(Melanotaenia trifasciata)
Boesemans Rainbowfish(Melanotaenia Boesemani)
Celebes Rainbowfish(Marosatherina ladigesi)
Dwarf Neon Rainbowfish(Melanotaenia praecox)
Forktail Blue Eye Rainbowfish(Pseudomugil furcatus)
Honey Blue Eye Rainbowfish(Pseudomugil Mellis)
View all Rainbowfish
Date Added: 15/03/2022 10:15:50 - Updated: 13/04/2022 17:36:54