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Blue Medaka
Oryzias latipes
Animalia›Chordata›Actinopterygii
Variety of Medaka · blue
📍 Japan
The Blue Medaka is a selectively bred color form displaying a soft blue iridescence. Like all medaka, it is extremely hardy, peaceful, and suitable for nano aquariums or outdoor tubs, thriving in groups.
Care Guide
Diet
Blue Medaka are omnivorous and accept high-quality flake foods, micro pellets, and small frozen foods like brine shrimp and daphnia. Feed small amounts once daily, only what they can consume in 2-3 minutes. They will also graze on algae and microorganisms in planted tanks.
Behavior
Blue Medaka are peaceful, schooling fish that thrive in groups of 6 or more and display their best coloration when kept together. They are active swimmers that prefer gentle water flow and spend most of their time in mid-water levels. They are hardy and adaptable, making them excellent for beginners and can tolerate a wide range of conditions.
Breeding
Blue Medaka breed readily in captivity with minimal intervention, making them ideal for hobbyists interested in selective breeding. Females lay adhesive eggs on plants or spawning mops daily once conditioned; eggs hatch in 7-10 days at 25-26°C. Separate fry to a nursery tank with infusoria or liquid fry food, as they are very small at birth.
Tank Mates
Similar size, peaceful temperament, and compatible water parameters make them ideal companions
Provides spawning substrate and cover without competing for space
Peaceful and occupy different ecological niches; medaka may eat shrimplets
Algae-eating bottom dweller that won't compete with medaka for food or space
Provides cover, spawning sites, and helps maintain water quality
Same species, compatible water needs, and can interbreed if desired
Common Diseases
Ich (Ichthyophthirius multifiliis)
White spots on body and fins, flashing against objects, lethargy, rapid gill movement
Raise temperature gradually to 28-30°C, perform daily 25% water changes, use aquarium salt (1 tsp per gallon) or ich medication for 7-10 days
Fin Rot
Frayed or deteriorating fins, discoloration at fin edges, lethargy
Improve water quality with frequent partial water changes, reduce stocking density, treat with antibacterial medication if severe
Bacterial Infection
Ulcers, sores, cloudy eyes, loss of appetite, color fading
Perform 50% water change immediately, maintain pristine water conditions, use broad-spectrum antibiotic medication as directed
Parasitic Infection
Excessive scratching, visible parasites, weight loss, clamped fins
Quarantine affected fish, treat with anti-parasitic medication, maintain elevated temperature and perform frequent water changes
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