Description
The Blue Medaka (Oryzias latipes), a selectively bred variant of the Japanese rice fish, is admired for its striking iridescent blue sheen and delicate, streamlined form. This elegant strain is a favourite among aquarists and breeders for its beauty, hardiness, and adaptability to both indoor aquaria and outdoor pond environments. Blue Medaka are surface-dwelling, shoaling fish that add movement and colour to planted setups or minimalist aquascapes, thriving in both naturalistic and ornamental environments.
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Features of a Blue Medaka - Ao Miyuki
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Grows up to 3.5 cm in length
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Metallic blue body with subtle translucency
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Peaceful, shoaling behavior; best kept in groups of 6 or more
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Hardy and adaptable to a wide range of water parameters
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Lifespan of 2 to 4 years
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Exhibits surface-oriented swimming and breeding behavior
The Best Aquarium Size for Blue Medaka - Ao Miyuki
A tank of 20 litres or more is sufficient for a small group of Blue Medaka. While they tolerate confined spaces well, providing a longer horizontal swimming area enhances natural behavior and coloration. Outdoor tubs and ponds are also suitable in mild climates.
Nice tank brands you can consider:
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Tank Mate Compatibility for Blue Medaka - Ao Miyuki
These medaka are peaceful and do best with similarly small, non-aggressive species. Suitable tank mates include:
Diet for Blue Medaka - Ao Miyuki
Blue Medaka are omnivorous and benefit from a varied diet. Feed high-quality micro pellets, crushed flakes, and occasional live or frozen foods such as baby brine shrimp, daphnia, and microworms. Multiple small feedings per day help support growth and vibrant coloration.
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Aquarium Setup for Blue Medaka - Ao Miyuki
Aquarium Filtration
Use a sponge or gentle internal filter to maintain clean water without creating excessive flow. These fish prefer calm surface conditions.
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Aquarium Plants
Live plants such as Java Moss, Hornwort, and Floating Ferns provide cover and enhance breeding. Dense planting also reduces stress.
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Aquarium Lighting
Moderate lighting highlights their pearlescent tones and supports plant growth. Avoid overly intense lighting.
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Aquarium Heating
Maintain water temperature between 20–26°C. A heater is recommended in cooler climates, especially during winter.
Aquarium Substrate
Fine sand or smooth gravel is ideal. While they spend most of their time near the surface, a natural substrate enhances biological filtration.
A variety of Substrates are available at Coburg Aquarium.
Aquarium Decorations
Include gentle decorations like driftwood, moss-covered stones, and floating plants. Avoid sharp edges and maintain open swimming areas near the top.
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