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Pseudomugil gertrudae




    The Axelrodi Rainbow is a peaceful schooling fish who enjoys some sunlight!

Quick stats:

Listed tank sizes are the minimum
Size: 1.5 inches (3.8 cm)
Tank: School of 6-8: 15 gallons (56.75 liters) or larger.
Strata: Mainly midwater to upper. Will feed at the top and bottom though.
PH: PH recommendation 5.2 – 6.7
Hardness: Medium hardness, 5 to 12° dGH
Temperature: 73°F to 86°F (23°-30° C)


Order: Atheriniformes (silversides)
Family: Pseudomugilidae
Genera: Pseudomugil
Species: Pseudomugil gertrudae


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Common name:

Spotted Blue-eye

    , Gertrude’s Blue-eye Rainbowfish


Asia and Oceania: 

    Several isolated groups throughout Northern Australia, southern New Guinea and the Aru Islands. Inhabits muddy-bottomed, blackwater billabongs, creeks, marshes, rainforest streams and lagoons.

General Body Form:Elongated fusiform body. Fins are primarily long and rounded. Two non-continuous dorsal fins and two non-continuous anal fins. Small superior-facing mouth. Large blue eyes. Male fins are generally long. Pectoral fins are short, pointed and rise vertically. First dorsal fin rises directly above the vent. It is angular and it’s central spine is stiffened and extended. Second dorsal fin is scallop-shaped and extends past the caudal peduncle. The caudal fin is indented and truncate. First anal fins are anterior to the vent and are short, pointed and have anterior spines that are stiffened and elongated. The second anal fin is an expansive fan-shape. It begins at the vent and continues past the caudal peduncle. The fins of females are shorter, smaller and more proportionate to the fish’s diminutive size compared to those of the male’s and they present no erectile spines.

Coloration:The standard coloration comes from Terangan on Aru Island, Indonesia. The male body is turquoise and the anterior ventrum is silver. There are black spots at the base of scales from the head to the distal edge of the second anal fin. Thin black lines trace along the posterior of the lateral line, the length of the dorsal crest and the ventrum from the first anal fin to the terminus of the caudal peduncle. Large blue eyes. The body coloration and patterning of females is the same as for males, only muted. Fins are short, transparent blue and have very faint black spots.

Maintenance:Freshwater and Brackish, The creeks, marshes streams and lagoons Pseudomugil gertrudae inhabit are primarily freshwater and differ mainly in the amount of decaying vegetation they contain. In the aquarium, water should be well-filtered, fully-cycled, soft, mildly acidic and well-oxygenated. Blackwater conditions may be replicated with the addition dried oak leaves or Indian almond leaves. Sensitive to fluctuations in water chemistry. The diminutive size of Pseudomugil gertrudae allows shoals of 6-8 to be kept in aquariums as small as 10 gallons (37.85 liters.) However, larger tanks are recommended for keeping stable water chemistry. Dark-colored sand or gravel substrate with a few dried leaves and branches on the surface may stand in for the muddy bottoms of creeks, lagoons, marshes and streams. Numerous stone caves and driftwood roots and branches provide hiding spaces, helping these fish feel secure and keeping their colors bright. Surface plants as well as rooted plants with floating leaves, such as lilies, should be densely planted. In many habitats, plants are thickest toward the center of the body of water and other areas are left open for swimming. Include mosses and fine-leaved ground covers for the benefit of fry. These dynamic little fish thrive in shoals of 6-10 in both species-only and micro-community tanks. Keep a ratio of 3 females to every one male. Tankmates should be similarly-sized to prevent over-competition for resources, such as Cardinal shrimp, Celestial pearl danios, Emerald dwarf rasbora, Harlequin rasbora, Neon yellow rasbora and Threadfin rainbows.

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Diet:They are omnivores, and feed primarily live or frozen artemia nauplii, bloodworms, daphnia, insect larvae, microworms, rotifers and zooplankton. Supplement with phytoplankton, crushed flake foods and micropellets for small-mouthed fish.


Biotope:Inhabits creeks, marshes streams and lagoons.

Breeding:Easy. Egg scatters. Sexual dimorphism: Males are brightly colored and have large fins with numerous black spots. The first spines of the anal fin as well as the first rays of the pectoral fin are rigid, elongated and bright yellow. Females are mutely colored and have slightly deeper bodies than males. Their fins are small and lack extended pectoral fin rays and extended anal fin spines. In nature, spawning takes place from October to December. In the aquarium, 10-20 potential mates should be conditioned by feeding them primarily live and frozen proteins one week prior to breeding. The spawning tank should contain a sponge filter, mosses, small-leaved ground covers, baby grasses and weighted spawning mops for receiving the eggs and consequent fry. Courting displays typically occur in the morning. Males initiate mating by chasing females and extending their dorsal and anal fins. Females that agree to mate accompany the males to the spawning place. Males may nudge the female’s pelvic base prior the two fish aligning side by side. The female responds by releasing 10-12 eggs (fewer than 3 at a time) as the male releases spermataphores that will fertilize the eggs. Pseudomugil gertrudae are continuous batch spawners, meaning that the spawning process will be repeated every day over the several day breeding period. Continuous spawning reduces competitive pressures on fry during early life stages. Remove adults from the breeding environment as soon as they are done spawning as they will eat their fry. Fry hatch within 9-12 days. Once they have consumed their yolk sacs, feed the fry powdered flake food, infusoria and microworms for the first week after hatching. Afterward, include brine shrimp nauplii as they transition to an adult diet.

Diseases:Most Rainbows and relatives are prone to skin flukes, parasitic infestations (protozoa, worms, etc.), ichthyobodo infection, parasitic infestations (protozoa, worms, etc.), bacterial infections (general), and bacterial diseases

5/5 - (18 votes)


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