Earth-Eye Medaka
Earth-eye is not a specific variety but a trait name for eyes that reflect light and look blue or similar. It appears in certified varieties such as Kimera (No. 39) and Devil (No. 40) of the Japan Medaka Association. Beginner-friendly and small, these fish suit a tank or container. Lifespan data is limited, and how the eyes look can change with lighting, so check the listing photos and description.
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Earth-Eye Medaka key facts
- Care level
- Beginner-friendly
- Lifespan
- Few reliable data
- Size
- About 3-4 cm (wild medaka reach up to 4 cm SL: FishBase)
- Diet
- Omnivore (floating prepared foods, live foods such as daphnia)
- Container & Tank
- The eye is easiest to see up close from the side, so a glass tank suits it.
- Breeding
- Expression varies; choose breeders showing the trait clearly in both eyes.
- Tank Mates & Compatibility
- Peaceful and fine with other medaka of similar size. To keep the variety's traits, do not let it breed with other varieties in the same container.
- Diet & Feeding
- Give floating food that is eaten within 3-5 minutes: at least twice a day in summer, once a day in spring and autumn, and little or none outdoors in winter.
- Cautions
- Never release ornamental medaka into rivers, ponds or paddies; hybridisation causes genetic pollution of wild medaka.
About Earth-Eye Medaka
Earth-eye medaka is a trait name for eyes that reflect light and look blue, not a single variety. Small and beginner-friendly. Key points to know before you bring one home.
7 things to know before welcoming a Earth-Eye Medaka
1A trait, not a variety
Earth-eye is a trait name describing how the eyes look, not a specific variety. Body shape and color depend on the variety it appears in. Check the listing for features beyond the eyes as well.
2How the eyes look
The eyes reflect light and appear blue or similar colors. The look can change with the lighting and the viewing angle. The fish may look slightly different in person than in photos, so keep that in mind.
3Certified varieties
The term is part of the names of two Japan Medaka Association certified varieties, Kimera (No. 39) and Devil (No. 40). Even with the same earth-eye trait, each variety has its own characteristics. If a particular variety interests you, read its description too.
4Small and easy to keep
These are small medaka, and the difficulty is rated beginner-friendly. They are easy to start in a tank or container, though more water volume generally keeps the water quality steadier. Choose a spot away from direct sun and sudden temperature swings.
5Acclimate carefully
Differences in water temperature and quality can stress fish in a new environment. Float the bag to match the temperature, then mix in your tank water little by little. Avoid feeding heavily right after arrival and let them settle in first.
6Tank mates
Medaka are generally gentle, but temperament and activity vary by individual. It is safer to avoid tank mates that are much larger or small enough to be swallowed. When keeping several together, watch for chasing or bullying.
7Lifespan and daily checks
Reliable data on lifespan is limited, so no clear figure can be given. Watching how they eat, swim, and how their eyes look each day makes changes easier to notice. If something seems unusual, review the water quality and their environment.
Frequently asked questions about Earth-Eye Medaka
- Q.Is earth-eye medaka a variety name?
- A.No, it is a trait name for how the eyes look rather than a specific variety. It appears in the names of Japan Medaka Association certified varieties such as Kimera (No. 39) and Devil (No. 40).
- Q.Can beginners keep them?
- A.The difficulty is rated beginner-friendly. They are small and easy to start in a tank or container, so careful acclimation and daily observation make them approachable.
- Q.How large do they grow?
- A.There is little data on the adult size of this variety, and individuals vary. It is a small medaka.
- Q.How long do they live?
- A.Reliable data on lifespan is limited, so no clear figure can be given. Keep a stable environment and check their condition through daily observation.
- Q.Do the eyes always look blue?
- A.The eyes reflect light and appear blue or similar colors, but the look varies with lighting, viewing angle, and the individual. They will not always look the same color.
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Care difficulty, lifespan, size and diet — all basics covered.
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