Description
Lake Kutubu Rainbowfish (Melanotaenia lacustris) – Vivid Blue from the Highlands of Papua New Guinea
The Lake Kutubu Rainbowfish (Melanotaenia lacustris) is renowned for its intense, shimmering blue coloration and peaceful, social nature. Native only to Lake Kutubu and the Soro River in Papua New Guinea, this species is a gem among rainbowfish, admired for its electric blue body, yellowish fins, and graceful schooling behavior.
With proper care, these fish can display dazzling coloration and become an eye-catching centerpiece in a well-maintained aquarium. Their vibrant hues and active swimming make them ideal for large, peaceful community setups.
Key Features:
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Latin Name: Melanotaenia lacustris
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Common Name: Lake Kutubu Rainbowfish
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Coloration: Iridescent electric blue with yellow or clear fins
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Temperament: Peaceful, energetic, and best kept in groups
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Size: Up to 4–5 inches
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Tank Requirements: Minimum 40 gallons, planted with open swimming areas
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Diet: Omnivorous—high-quality flakes, pellets, and live/frozen foods like bloodworms or brine shrimp
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Compatibility: Excellent with other peaceful mid- to top-dwelling species; thrives in schools of 6 or more
Tips:
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Provide a mixed-gender group for best color and natural behavior.
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Keep water clean and well-oxygenated with regular water changes.
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Use a dark background or substrate to enhance their brilliant blue.
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Ideal tankmates include other rainbowfish, peaceful barbs, tetras, and catfish.
Why Choose This Fish?
The Lake Kutubu Rainbowfish offers a mesmerizing splash of iridescent blue and lively activity to any freshwater setup. Perfect for aquarists seeking a colorful, peaceful schooling fish with a fascinating wild origin, this species brings both beauty and energy to your aquarium.
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