Pseudomugil signifer — Pacific Blue Eye
Family: Pseudomugilidae
Origin: Eastern Australia — coastal streams, estuaries, and tidal creeks from Queensland to New South Wales
Size: Up to 4 cm (1.6 inches)
Lifespan: 1–2 years
 
Natural Habitat
Environment: Slow-moving to moderately flowing freshwater and brackish systems
Water Conditions: Shallow waters with aquatic vegetation and leaf litter
Temperature Range: 20–28°C (68–82°F)
 
Physical Description
Body Shape: Slender, streamlined, and slightly translucent
Coloration:
Pale silver to golden body
Iridescent blue eyes (hence the name)
Males have extended fin rays with yellow, white, and black highlights
Fins: Double dorsal fin (a Pseudomugilid trait); delicate and brightly colored in males
 
Aquarium Care
Tank Size: Minimum 40 litres (10 gallons) for a small group
Water Parameters:
pH: 6.5–8.0
Hardness: Soft to moderately hard
Temperature: 20–28°C (68–82°F)
Water Flow: Gentle
Substrate: Sand or fine gravel
Décor: Plants, floating vegetation, driftwood, and shaded areas
Filtration: Gentle filtration with stable, clean water
 
Diet
Type: Omnivorous micropredator
Preferred Foods:
Live or frozen foods (daphnia, baby brine shrimp, cyclops)
High-quality micro pellets or crushed flakes
Feeding Frequency: 1–2 times daily
 
Behavior & Tank Mates
Temperament:
Peaceful, social, and best kept in groups of 6 or more
Males display vibrant colors and courtship dances
Compatible Tank Mates:
Other small, peaceful species (ricefish, small rasboras, pygmy corydoras)
Can be kept in community tanks or species-only setups
Behavior Notes:
Best coloration and behavior seen in planted, low-stress environments
 
Breeding
Spawning Method: Egg scatterer
Breeding Conditions:
Spawns readily in captivity on fine plants or spawning mops
Eggs hatch in 1–2 weeks depending on temperature
Fry Care:
Feed with infusoria or powdered fry food; separate from adults if needed