Aquamarine Medaka

Aquamarine Medaka key facts

Care level

Intermediate

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 blue-glowing fins look best from the side in a glass tank; avoid sharp décor and strong currents.

Breeding

A new 2024 variety whose siblings vary; choose breeders combining ruby eyes, long fins and fin shine.

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 Aquamarine Medaka

Aquamarine Medaka: an albino medaka with ruby eyes and long, blue-shimmering morpho fins, developed by Toshihiro Wada in 2024. A small medaka rated intermediate to keep.

7 things to know before welcoming a Aquamarine Medaka

1. 1Keep the current gentle

   Because the fins grow out as real long fins, a strong current makes swimming harder and can leave the fins easily damaged. A gentle filter such as a sponge filter is a safer choice. Adjust the outflow direction too, so the fins are not pushed around.

2. 2The blue fin shimmer

   The blue glow comes from the morpho-type fin sheen, and how it looks changes with the lighting, the background color, and the viewing angle. A darker background and soft lighting help the shimmer stand out. The effect varies from fish to fish, so it helps to check photos or videos before choosing.

3. 3Avoid harsh lighting

   Albino fish with ruby eyes are said to sometimes seem unsettled in very bright conditions. Floating plants that shade part of the surface give them a place to relax. Too little light makes them hard to enjoy, so adjust the brightness while watching how they behave.

4. 4Choose tank mates carefully

   Medaka are generally peaceful, but long fins can be nipped by other fish, and slower swimmers may lose out at feeding time. Avoid fin-nippers and fast, pushy fish, and pick companions that are just as calm. Starting with Aquamarine alone or with the same variety is the safest approach.

5. 5Keep the water clean

   With such long fins, dirty water makes them more prone to fraying and damage. The basics are frequent small water changes and avoiding overfeeding. When changing water, match the temperature of the new water so the fish are not exposed to sudden changes.

6. 6Give them room to swim

   Adults are small, but they swim with long, flowing fins, so a roomy container suits them better. Add soft plants or floating plants for resting spots, and avoid rough decor that could snag the fins. A lid to prevent jumping is also a good idea.

7. 7Acclimate after arrival

   When your fish arrives, float the bag in the container to match the temperature, then gradually introduce it to the new water. It may be tired from shipping, so avoid big changes for a while and start with small feedings. If anything about the body or fins looks off, it is reassuring to ask the breeder early.

Frequently asked questions about Aquamarine Medaka

Q.Can beginners keep Aquamarine Medaka?

A.It is rated as intermediate. You need to watch the water flow and tank mates to protect the long fins, so it is easier once you are comfortable with basic medaka care. With a well-prepared setup and careful attention, beginners can still give it a try.

Q.How large do they get?

A.There is little data on the adult size of this variety, and individuals vary. It is a small medaka, but its long, flowing fins do best in a roomy container.

Q.How long do they live?

A.There is little reliable information on the lifespan of Aquamarine Medaka, so we cannot give a clear figure. It also depends on the environment and the individual fish, so consistent water care and regular observation matter most.

Q.Is the blue shimmer the same on every fish?

A.The blue shimmer from the morpho-type fin sheen changes with the lighting, the background, and the viewing angle. It also varies between individuals, so check the listing photos and videos, and ask the breeder if you have questions.

Q.Who developed Aquamarine Medaka, and when?

A.It is a new variety developed by Toshihiro Wada in 2024. It combines an albino white body, ruby eyes, and real long fins that shimmer blue with a morpho-type sheen.

Useful tools for Aquamarine Medaka care

Learn more about Aquamarine Medaka in the encyclopedia

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