Pet Wiki

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Forktail Blue-eye

Pseudomugil furcatus Nichols, 1955

Also called Forktail rainbowfish, Yellow forktail

SpeciesShort profile

From Eastern Papua New Guinea: lowland rainforest streams of the Musa and Kwagila river basins (Northern and Milne Bay provinces), between Dyke Ackland Bay and Collingwood Bay.123

At a glance the quick version

Length4 to 6 cm21
Sizetiny

FishBase: 5 cm SL males, 4 cm SL females; Seriously Fish gives 6 cm SL

Bright, lively nano fish
Peaceful in a calm community
Spawns readily in a planted tank
12

Looks how to spot one

Scaled, slender blue-eye

A small, slim fish with a deeply forked tail, which gives it its name. Males are more patterned and colourful than females and have longer dorsal and anal fins.1

ColoursYellow (fins)Blue eye1

Personality what they are like

Peaceful and sociable; it suits a community of similar-sized calm fish such as small gobies and gudgeons.12

Daily activity how busy a day looks

An active shoaling fish that swims in the upper and middle water, in gentle to moderate flow.1

Grooming and care the hands-on bits

Needs a biologically mature tank with stable water conditions; Seriously Fish rates it moderate to keep.1

Home where they are happiest

Minimum tank base about 60 x 30 cm (around 54 litres). Temperature 24-28 °C, pH 7.0-8.0, hard water (Seriously Fish gives 15-30 dGH; FishBase lists 5-12 dH). Dense plants, driftwood, floating plants and well-oxygenated water.12

Food basics what goes in the bowl

In the wild it eats tiny floating plankton and invertebrates. Offer small live foods such as Daphnia, Moina, baby brine shrimp and microworms, plus small floating dry food.1

Company who they like around

Keep a group of at least 8-10.1

The story where it all began

Nichols described it in 1955. It spent some years in the genera Popondetta and Popondichthys before being returned to Pseudomugil in 1989. The fish in the hobby are believed to descend from a single collection made in 1981.13

Fun facts for the dinner table

  1. 1

    The species name furcatus means 'forked', after its tail.1

  2. 2

    Pseudomugil means 'false Mugil', a nod to the grey mullet genus.1

  3. 3

    A male may spawn with several females in one day, and spawning can go on all day in warm weather.1

  4. 4

    Its eggs take around three weeks to hatch, which is long for such a small fish.1

Recognised by the official bits

IUCN Red List
Data Deficient (assessed June 2020)2
Taxonomy
Family Pseudomugilidae; described by Nichols in 1955; formerly placed in Popondetta and Popondichthys1

The care rhythm a typical week and year

A typical home-care rhythm for a Forktail Blue-eye. A starting point, not a vet's advice.

Owner questions the things everyone asks

How often should I feed my Forktail Blue-eye?

Feed small amounts once or twice a day. Furry Diary's starting plan is to feed daily, offering only what they can eat in a couple of minutes.1 Pet Wiki plan

What does a Forktail Blue-eye eat, and what should it never eat?

They enjoy small live foods like Daphnia, baby brine shrimp, and microworms, plus tiny floating dry food. Never feed large or sinking foods that could cause digestive issues; ask your vet or a good breeder for a safe list.1

How much space does a Forktail Blue-eye need?

A minimum tank base of about 60 x 30 cm (around 54 litres) is recommended for a small group. They are active shoalers, so more space is always better.1

What temperature, light or water does a Forktail Blue-eye need?

Keep water temperature between 24-28 °C, with a pH of 7.0-8.0 and hard water (15-30 dGH). Provide dense plants, driftwood, floating plants, and well-oxygenated water with gentle to moderate flow.12

How often should I clean a Forktail Blue-eye's home?

Furry Diary's plan suggests a weekly 25% water change and glass cleaning, plus a monthly filter rinse in old tank water (never tap water). Always test water weekly to keep conditions stable. Pet Wiki plan

Can a Forktail Blue-eye live with others?

Yes, they are peaceful and sociable, ideal for a community of similar-sized calm fish like small gobies and gudgeons. Keep a group of at least 8-10 of their own kind for best wellbeing.12

How long does a Forktail Blue-eye live?

Lifespan varies depending on care and environment; ask your vet or a good breeder for typical expectations. With stable water and good diet, they can thrive for a few years.

Can I handle a Forktail Blue-eye?

No, handling is not recommended as it stresses the fish and can damage their delicate scales and fins. Enjoy watching them swim in their tank instead.1

Written from the sources on this page, a few checked guides (VCA, ASPCA, RSPCA) and Pet Wiki's own starting care plan. A friendly guide, not a vet's advice.

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Where this comes from

Every fact on this page has a numbered source. Spotted an error? [email protected].

  1. Seriously Fish: Pseudomugil furcatus (Forktail Blue-eye) seriouslyfish.comused for names, distribution, habitat, tank size, water parameters, diet, behaviour, group size, history, fun facts
  2. FishBase: Pseudomugil furcatus, Forktail rainbowfish fishbase.seused for length by sex, distribution, water ranges, IUCN status
  3. Wikipedia: Pseudomugil furcatus en.wikipedia.orgused for distribution, taxonomy history

Checked 2026-09-30. Text is written in our own words from these sources.