Western rainbow - Melanotaenia splendida australis
Scientific name: Melanotaenia splendida australis
Common name: Western rainbow
Family: Melanotaeniidae
Usual size in fish tanks: 9 - 10 cm (3.54 - 3.94 inch)
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Recommended pH range for the species: 6.5 - 8
Recommended water hardness (dGH): 5 - 12°N (89.29 - 214.29ppm)
0°C 32°F30°C 86°F
Recommended temperature: 22 - 28 °C (71.6 - 82.4°F)
The way how these fish reproduce: Spawning
Where the species comes from: Oceania
Temperament to its own species: peaceful
Temperament toward other fish species: peaceful
Usual place in the tank: Top levels
Overview
The Western Rainbow (Melanotaenia splendida australis) is a peaceful and active freshwater fish native to northwestern Australia. Known for its shimmering scales and social nature, it thrives in well-maintained aquariums with open swimming space and a varied diet.
Origin and Natural Habitat
Western Rainbowfish are commonly found in northwestern Australia, where they inhabit slow-moving rivers, streams, and floodplains. Their natural environment features clear, well-oxygenated water with abundant aquatic vegetation.
Appearance and Size
These fish grow to an adult size of approximately 9 - 10 cm (3.54 - 3.94 inches). Males typically display more vibrant colors, while females tend to have a deeper body shape.
Tank Requirements
- Tank Size: A minimum of 80 liters (~20 gallons) is recommended for a small group.
- Water Parameters:
- pH: 6.5 - 8.0
- Water Hardness: 5 - 12°N (89 - 214 ppm)
- Temperature: 22 - 28°C (71.6 - 82.4°F)
- Tank Setup: Provide a well-planted aquarium with open swimming areas. A secure lid is necessary, as these fish are excellent jumpers.
Temperament and Tank Mates
Western Rainbowfish are peaceful schooling fish that should be kept in groups of at least 6 individuals. They make excellent tank mates for other peaceful community fish, including:
- Other rainbowfish species
- Tetras
- Corydoras catfish
- Livebearers such as guppies and platies
Avoid housing them with large, aggressive species that may intimidate or outcompete them for food.
Feeding and Diet
Western Rainbowfish are omnivores and require a balanced diet:
- High-quality flake or pellet food as a staple diet
- Live or frozen foods such as bloodworms, brine shrimp, and daphnia
- Vegetable matter, including blanched lettuce or spirulina-based foods
Including plant-based foods in their diet helps maintain their vibrant coloration and digestive health.
Sexing
Males tend to be slimmer and exhibit more intense coloration, whereas females have deeper bodies and subdued colors.
Breeding
Breeding Western Rainbowfish can be rewarding with the right setup:
- Provide spawning mops or fine-leaved plants for egg-laying.
- Once spawning occurs, transfer the eggs to a separate tank to prevent predation.
- The eggs hatch in about two weeks, and the fry are very small.
- Feed newly hatched fry with Infusoria or vinegar eels until they are large enough for crushed flake food.
Lifespan
With proper care, Western Rainbowfish can live up to 5 years in a well-maintained aquarium.
Health and Maintenance
Although hardy, these fish are sensitive to high nitrate levels. Regular water changes and efficient filtration are essential for their health. Ensure stable water parameters to prevent stress and disease.
Conclusion
The Western Rainbow (Melanotaenia splendida australis) is a stunning and active fish that adds movement and color to community aquariums. Their peaceful nature, hardiness, and ease of care make them a great choice for both beginner and experienced aquarists.
Picture
Thanks to Sayer for his picture!