Oto Heterodon
Otopharynx heterodon
Oto Heterodon, also noted as a Royal Blue Hap, is a Lake Malawi hap with a more moderate personality than many larger aggressive haps. Its adult color and manageable temperament make it a good candidate for thoughtfully stocked peacock and hap aquariums.
Origin and Habitat
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Native Region: Throughout Lake Malawi.
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Natural Habitat: Intermediate zone.
Physical Characteristics
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Size: 7-8 inches.
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Coloration: Mature males can show royal blue coloration; females and juveniles are usually more subdued.
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Body Shape: Laterally compressed hap body with an active but not overly bulky profile.
Behavior and Temperament
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Temperament: More peaceful than many haps, sometimes mildly aggressive.
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Social Behavior: Best kept with similarly tempered Lake Malawi haps and peacocks, with enough room for males to establish space.
Aquarium Care
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Tank Size: A 75 gallon aquarium or larger is recommended.
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Water Parameters: 74-84°F, pH 7.4-8.4, hard water.
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Tank Setup: Provide sand, open swimming space, and rockwork for structure. Maintain strong filtration and stable hard, alkaline water.
Diet and Feeding
Breeding
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Breeding Type: Maternal mouthbrooder.
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Breeding Notes: Like other Malawi haps, females hold eggs and fry in the mouth. Fry should be given cover or separated after release for better survival.
Tank Mates
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Compatible With: Peaceful to moderately assertive Lake Malawi haps and peacocks.
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Avoid: Very aggressive mbuna, small community fish, and tank mates that require soft acidic water.
