Pacific Blue-eye – Pseudomugil signifer 3–4cm

Buy Pacific Blue-eyes online and add an active, peaceful Australian native fish to your aquarium. Pseudomugil signifer is known for its brilliant blue irises, translucent silver-to-olive body and attractive fin displays.

Pacific Blue-eyes are an excellent choice for fishkeepers looking for a small Australian native aquarium fish. They suit planted aquariums, Australian biotope displays and peaceful community tanks containing compatible species.

These social schooling fish look most impressive when kept in a suitable group. Order several together to enjoy more confident swimming, natural social behaviour and better male display colour.

Fish supplied: One Pacific Blue-eye measuring approximately 3–4cm. Colour, sex, fin development and exact size cannot be guaranteed and may vary between individual live fish.

Quick Care Guide

Scientific name	Pseudomugil signifer
Common name	Pacific Blue-eye
Sale size	Approximately 3–4cm
Adult size	Varies between geographic populations; recorded males may reach approximately 8.8cm, although many aquarium populations remain smaller
Temperament	Peaceful, active and social
Recommended group	At least 6; preferably 8–10 or more
Recommended aquarium	At least 60 litres for a suitable group, with good horizontal swimming space
Temperature	Approximately 20–26°C; avoid sudden temperature changes
pH	Approximately 6.5–7.8, with stable conditions more important than chasing an exact value
Diet	Small prepared, insect-based, frozen and live foods
Swimming level	Mostly upper and middle levels
Difficulty	Easy to intermediate

Why Choose Pacific Blue-eyes?

• Genuine Australian native aquarium fish
• Distinctive reflective blue irises
• Peaceful temperament suited to carefully planned community tanks
• Active schooling behaviour and attractive male fin displays
• Well suited to planted aquariums with open swimming space
• Accepts appropriately sized prepared, frozen and live foods

Pacific Blue-eyes are a good option for aquarists who want something different from common tropical community fish. Their compact size, active behaviour and native Australian origin make them particularly appealing in planted displays.

Explore more species in our Australian native fish range.

Aquarium Setup

Pacific Blue-eyes do best in a mature, filtered aquarium containing both plant cover and open swimming areas. Fine-leaved and floating plants provide security and may also be used as spawning sites.

Provide gentle-to-moderate water movement, reliable filtration and good oxygenation. Consistent water quality is important, so test the water regularly and complete routine partial water changes.

Use a secure aquarium lid. Pacific Blue-eyes are active near the surface and may jump when startled, chased or engaged in fast group activity.

A 60-litre aquarium is a practical starting point for a suitable group. Larger or more active geographic forms will benefit from additional swimming length. Choose an aquarium based on the fish’s eventual adult size rather than its size when purchased.

Create a more natural environment with our live aquarium plants. You can also monitor ammonia, nitrite, nitrate and pH with suitable aquarium test kits.

Group Size and Behaviour

Pacific Blue-eyes are social fish and should not normally be kept alone. We recommend purchasing at least six, while a group of eight to ten or more generally produces more confident behaviour and a stronger visual display.

Males may display their extended fins and spar with one another, particularly when competing for the attention of females. Serious aggression is uncommon when the group has sufficient space, suitable numbers and plenty of visual cover.

Keeping only one or two may result in shy behaviour and prevents the fish from displaying its normal group interactions.

Compatible Tank Mates

Pacific Blue-eyes are generally peaceful and can work well in an appropriately planned community aquarium. Choose small, non-aggressive tank mates that enjoy similar temperatures and water conditions.

Possible tank mates include:

• Compatible Australian rainbowfish
• Other peaceful native fish
• Small peaceful tetras
• Small rasboras
• Corydoras
• Other similarly sized community fish

Avoid housing Pacific Blue-eyes with large predatory fish, highly aggressive species or persistent fin nippers. Always compare the adult size and care requirements of every species before combining them.

Adult shrimp may be suitable in some established aquariums, but very small shrimp offspring and fish fry may be eaten. Pacific Blue-eyes should therefore not be considered completely shrimp-safe.

Feeding Pacific Blue-eyes

In the wild, Pacific Blue-eyes feed on mosquito larvae and other small insects. In an aquarium, offer a varied diet containing suitably sized foods.

Suitable options include:

• Quality crushed flakes
• Fine micro pellets
• Small insect-based foods
• Frozen or live brine shrimp
• Daphnia and other small aquatic foods

Their mouths are relatively small, so choose food that can be swallowed easily. Feed modest portions once or twice daily and avoid leaving uneaten food in the aquarium.

A varied diet can help support healthy growth, condition and male display colour. Browse our native fish food and tropical fish food ranges for suitable options.

Freshwater and Brackish Habitats

Pacific Blue-eyes occur naturally in eastern Australian coastal streams and may also be found around estuarine and mangrove habitats. Some populations tolerate brackish conditions, but this does not mean aquarium salt is required for normal care.

They can be maintained in clean, stable freshwater. Avoid making sudden changes to temperature, pH, hardness or salinity, particularly when introducing newly transported fish.

If you are planning a brackish aquarium, research the requirements of the particular population and increase salinity gradually. Do not add salt to a normal community aquarium without considering every animal and plant in the tank.

Breeding Pacific Blue-eyes

Pacific Blue-eyes deposit small adhesive eggs among aquatic vegetation and other fine surfaces. Well-conditioned males display their fins while courting females.

Fine-leaved plants or spawning mops can be provided if you want to breed them. Adults may eat eggs or newly hatched fry, so breeders commonly move the spawning material or adult fish to a separate aquarium.

Newly hatched fry require microscopic or very fine foods before they are large enough to accept newly hatched brine shrimp and commercial fry foods.

Can Pacific Blue-eyes Live in a Pond?

Pacific Blue-eyes may be kept in a properly secured outdoor pond where the local climate, seasonal temperature and water quality remain suitable. The pond should provide plant cover and protection from birds and other predators.

Do not assume Pacific Blue-eyes are automatically safe with frogs, frog eggs or tadpoles. Compatibility depends on the frog species, fish size, pond design and available habitat.

Outdoor ponds must be designed so fish cannot escape during heavy rain, flooding or overflow. Check applicable state and local requirements before keeping aquarium fish outdoors.

Never release aquarium fish into creeks, dams, drains or other waterways. This applies even to Australian native species because released fish can spread disease and interfere with genetically distinct local populations.

Buy Pacific Blue-eyes Online in Australia

Pacific Blue-eyes are a rewarding choice for aquarists wanting a colourful, peaceful and genuinely Australian addition to their aquarium. They are particularly well suited to planted native displays and community tanks containing similarly sized, non-aggressive fish.

Because this is a schooling species, consider ordering at least six compatible individuals rather than keeping a single fish. Before purchasing, make sure your aquarium is fully cycled, securely covered and large enough for the complete group.

Shop online for Pacific Blue-eyes and explore more Australian native fish for sale at Aquaholics Online. Live-fish availability can change, so order while stock is available or use the stock notification option if this product is temporarily sold out.

Live Fish Delivery

We deliver Pacific Blue-eyes and other live aquarium fish to eligible locations across Australia. Live-fish delivery remains subject to livestock availability, regional restrictions, weather conditions and the current shipping schedule.

Before ordering, please review our live fish and plant shipping information. This page explains eligible locations, receiving requirements, acclimation and the current Arrive Alive policy.

Build your Australian native aquarium with a group of Pacific Blue-eyes. Order online for delivery to eligible Australian locations, or explore our complete Australian native fish range to find compatible additions for your aquarium.

Frequently Asked Questions

How many Pacific Blue-eyes should I keep?

Keep at least six Pacific Blue-eyes together. A group of eight to ten or more generally produces more confident behaviour and a more impressive display.

Can Pacific Blue-eyes live in a freshwater aquarium?

Yes. Pacific Blue-eyes can be maintained in clean, stable freshwater. Although some wild populations occur in brackish habitats, aquarium salt is not normally required.

Are Pacific Blue-eyes suitable for a community aquarium?

Yes. They are generally peaceful and can live with small, non-aggressive fish that have compatible temperature, water and aquarium-size requirements.

How large do Pacific Blue-eyes grow?

Adult size varies between geographic populations. Many aquarium fish remain relatively small, but recorded males can reach approximately 8.8cm and females approximately 6.3cm.

What do Pacific Blue-eyes eat?

Offer fine flakes, micro pellets and suitably sized frozen or live foods such as brine shrimp and daphnia. Their natural diet includes mosquito larvae and other small insects.

Do Pacific Blue-eyes need a covered aquarium?

Yes. A secure lid is strongly recommended because these active fish may jump when startled or during fast group activity.

Can Pacific Blue-eyes live in an outdoor pond?

They may suit a secure, predator-protected pond where local temperatures and water conditions remain appropriate. Prevent all escapes and never release aquarium fish into natural waterways.

Where can I buy Pacific Blue-eyes in Australia?

You can buy Pacific Blue-eyes online from Aquaholics Online when stock is available. We deliver live fish to eligible Australian locations, subject to regional restrictions, suitable weather and our current live-fish shipping schedule.