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Pacific Blue Eye
Pseudomugil signifer
Animalia›Chordata›Actinopterygii›Pseudomugilidae
📍 Eastern Australia
The Pacific blue eye is a small, hardy Australian native with striking yellow fins tipped in black and white, and the characteristic brilliant blue eyes of the genus. It is more adaptable than many pseudomugil, tolerating a range of salinities from fresh to brackish. An ideal nano fish for those wanting an unusual Australian species.
Care Guide
Diet
Pacific Blue Eyes are micro predators requiring small, high-quality foods. Feed a varied diet of micro pellets, small frozen foods (brine shrimp, daphnia), and occasional live foods once daily in small portions. Supplement with quality flake food designed for small fish to ensure balanced nutrition.
Behavior
Highly active and social fish that thrive in schools of 8 or more, displaying constant movement through mid-water zones. They are peaceful and non-aggressive, making them ideal community fish, though they may be intimidated by larger or boisterous tank mates. Males display subtle color intensification during social interactions.
Breeding
Breeding in captivity is possible but requires patience and specific conditions. Provide dense vegetation, slightly acidic water (pH 6.5-7.0), and temperatures around 24-25°C. Eggs are scattered among plants and hatch in 7-10 days; fry are tiny and require infusoria or liquid fry food initially.
Tank Mates
Similar size, peaceful temperament, and identical water parameter requirements make them ideal companions
Non-aggressive invertebrates that occupy different ecological niches and enhance water quality
Peaceful algae eaters with compatible water needs; avoid overcrowding in small tanks
Foreground plant that provides shelter and spawning substrate without competing for space
Low-light plant that creates hiding spots and maintains water quality without requiring high nutrients
Similar size and peaceful nature, though slightly larger; ensure adequate space in 10+ gallon tanks
Common Diseases
Ich (Ichthyophthirius multifiliis)
White spots on body and fins, rapid breathing, lethargy, flashing against objects
Raise temperature gradually to 28-29°C, perform daily 25% water changes, use ich medication (malachite green or formalin) following label directions; maintain excellent water quality
Fin Rot
Frayed or deteriorating fins, discoloration at fin edges, progressive fin loss
Improve water quality through frequent partial changes, remove decaying plant matter, use antibacterial medication if severe; ensure adequate filtration and avoid overcrowding
Bacterial Infection
Cloudy eyes, open sores, loss of color, lethargy, appetite loss
Perform 50% water change immediately, use broad-spectrum antibiotic medication, isolate affected fish if possible; maintain pristine water conditions and avoid stress
Parasitic Infection
Excessive scratching, visible parasites, weight loss, clamped fins, respiratory distress
Use anti-parasitic medication (copper-free for sensitive species), perform daily water changes, quarantine new fish for 2 weeks before introduction
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Quick Facts
- diet
- Micro predator – small live and frozen foods, micro pellets
- schooling
- 8+ recommended
- tank size
- 10 gallons minimum
- temperament
- Peaceful nano schooling fish
Water it likes
- ph
- 6.5–8.0
- hardness
- 5–20 dGH
- temperature
- 64–79°F (18–26°C)