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The Neon Blue-Eye (Pseudomugil simulans) is a small, freshwater ray-finned fish belonging to the family Pseudomugilidae. It is highly prized in the aquarium hobby for its vibrant coloration and peaceful demeanor. This species exhibits a slender, somewhat compressed body, typical of blue-eyes, with distinctively large, iridescent blue eyes that give the fish its common name. Males are generally more colorful and develop extended finnage, particularly in the dorsal and anal fins, during breeding periods. They are active swimmers, often found in shoals among aquatic vegetation.
Physical Characteristics
- Body shape
- elongated
- Coloration
- Males display a vibrant iridescent blue to greenish-blue body, often with a yellow or orange tint on the ventral side. The fins are typically translucent with yellow or orange margins, and the first dorsal fin often has a black spot. Females are generally duller in coloration, with less extended fins. Both sexes possess prominent, large, iridescent blue eyes.
- Scale type
- cycloid
- Mouth position
- superior
- Distinctive features
- Large, iridescent blue eyes, Vibrant blue-green body coloration in males, Extended dorsal and anal fins in mature males, Small size, typically under 4 cm
- Dorsal fin
- Two dorsal fins; the first is small and spiny, the second is larger and soft-rayed. In males, the first dorsal fin often has a prominent black spot and the second dorsal fin is elongated.
- Tail fin
- Forked caudal fin, typically translucent with yellow or orange hues.
- Pectoral fin
- Small and clear, positioned high on the body.
- Distinctive fins
- Anal fin is elongated in males, mirroring the second dorsal fin. Pelvic fins are small and located ventrally.
Identification Tips
Eye Color
The most striking feature is their large, brilliant iridescent blue eyes, which are a key identifier.
Body Coloration
Look for the vibrant blue-green body, especially in males, which often have yellow or orange highlights on their fins and ventral side.
Fin Shape (Males)
Mature males exhibit noticeably elongated and pointed dorsal and anal fins, often with distinct black markings on the first dorsal fin.
Size
Their small size, typically under 4 cm, helps distinguish them from larger rainbowfish species.
Habitat
- Water type
- freshwater
- Depth
- Shallow waters, typically less than 1 meter
- Environment
- Found in slow-moving to still waters of coastal streams, swamps, and lagoons, often heavily vegetated with aquatic plants and submerged roots. They prefer clear water with sandy or muddy substrates.
- Geographic range
- Endemic to northern Australia, specifically found in the Cape York Peninsula region of Queensland. Its distribution is primarily restricted to freshwater systems draining into the Gulf of Carpentaria and the Coral Sea.
Aquarium Information
- Care level: intermediate
- Temperament: peaceful
- Diet: omnivore
- Minimum tank size: 10 gallons
- Temperature: 22-280C (72-820F)
- pH level: 6.0-7.5
- Hardness: 5-15 dGH
- Compatibility: Excellent for community tanks with other small, peaceful fish such as other Pseudomugil species, small tetras, rasboras, and dwarf corydoras. Avoid housing with large or aggressive species.
- Special requirements: Requires a well-planted aquarium with plenty of hiding spots and open swimming areas. A dark substrate can enhance their coloration. They thrive in stable water conditions and benefit from a varied diet including high-quality flake food, micro-pellets, and live or frozen foods like daphnia, brine shrimp, and microworms. Good water flow is appreciated, mimicking their natural stream habitats.
Wild Information
- Conservation status: least concern
- Seasonality: Breeds year-round in suitable conditions, with increased activity during warmer, wetter periods in their natural habitat.
- Market price: Moderate (for aquarium trade)
- Commercial importance: medium
- Taste: Not applicable
- Texture: Not applicable
- Nutritional value: Not applicable
Key Facts
Iridescent Eyesinteresting
The 'blue-eye' in its name refers to the striking, iridescent blue coloration of its large eyes, a prominent feature across the Pseudomugil genus.
Sexual Dimorphismbehavior
Males are significantly more colorful and develop elongated dorsal and anal fins, especially during courtship, making them easily distinguishable from females.
Micro-predatorbehavior
In the wild, Neon Blue-Eyes primarily feed on small aquatic invertebrates and zooplankton, playing a role in controlling insect populations.
Habitat Specificityinteresting
They are often found in highly vegetated, shallow, and slow-moving waters, indicating a preference for specific microhabitats within their range.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: not recommended
- Handling notes: Pseudomugil simulans is a small, delicate fish. Handle with care using a fine-mesh net to avoid damaging their fins or scales. They are not venomous and pose no threat to humans.
Similar Species
Pacific Blue-Eye
Pseudomugil signifer
P. signifer generally has a more widespread distribution along the eastern coast of Australia. While also having blue eyes, P. simulans typically exhibits a more intense, uniform blue-green body coloration and often more pronounced fin extensions in males. P. signifer can also grow slightly larger and may show more yellow or orange in its body rather than the strong blue of P. simulans.
Forktail Blue-Eye
Pseudomugil furcatus
P. furcatus is native to Papua New Guinea and is characterized by prominent yellow fins with black margins, especially on the caudal fin, which is distinctly forked. While also having blue eyes, its body coloration is typically more silvery-yellow compared to the strong blue-green of P. simulans.
Red Neon Blue-Eye
Pseudomugil luminatus
P. luminatus, from West Papua, is distinguished by its intense red-orange coloration, particularly in the fins and often along the body, contrasting with the predominantly blue-green hues of P. simulans. The finnage patterns also differ, with P. luminatus often having more pronounced red in the dorsal and anal fins.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Atheriniformes
- Family
- Pseudomugilidae
- Genus
- Pseudomugil
- Species
- simulans
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