Sasha Medaka

Sasha 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

With weak background adaptation, the black rims hold even in white containers, where the contrast shows well.

Breeding

Rim strength and head whiteness vary; choose breeders with strong, unbroken rims.

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 Sasha Medaka

Sasha Medaka (紗々) has a white, transparent-scaled body with bold black-rimmed scales. The contrast between its white head and fins and the dark net pattern is striking, and the black holds up even in white containers. Beginner-friendly.

7 things to know before welcoming a Sasha Medaka

1. 1Little color shift

   Sasha shows little background-color response, so its black rims tend not to fade even in a white container. That makes the look less dependent on the color of your container. Appearance still varies between individuals, so it is reassuring to check photos of the actual fish.

2. 2Check each fish

   The way the black rims appear, the fineness of the net pattern, and the whiteness of the head and fins differ from fish to fish. Compare the listing photos to see whether the contrast between the dark pattern and the white areas suits your taste. If anything is unclear, ask the seller before you decide.

3. 3Beginner-friendly

   The difficulty level is beginner-friendly. With well-prepared water and a routine of daily feeding and observation, it is an easy variety to start with, even if you have never kept medaka. Begin with a small number of fish rather than a crowd, and get used to the setup first.

4. 4Give them room

   Adults are small, so even a modest container can work to begin with. A larger volume of water generally keeps water quality steadier, so choose a container with room to spare for the number of fish. Because the black stays vivid even in white containers, you can pick the container color you like.

5. 5Calm temperament

   Medaka are generally gentle fish, and it is a joy to watch them swim in a group. Keep them with other medaka, and separate them from fin-nippers or fish large enough to eat them. Newly hatched fry can be eaten by adults, so it helps to have a separate container ready.

6. 6Acclimating on arrival

   When your fish arrive, float the bag in the container to match the temperature, then add small amounts of tank water to adjust them to the water quality. Sudden changes in temperature or water conditions can make fish unwell. Always use dechlorinated water, and avoid changing a large amount of water at once.

7. 7Feeding and checks

   Feed only as much as the fish finish, and remove leftovers, since uneaten food can degrade the water. Look at their swimming, fins, and body surface every day so you notice anything unusual early. If something seems off, start by reviewing the water quality and temperature.

Frequently asked questions about Sasha Medaka

Q.Can beginners keep Sasha Medaka?

A.Yes, the difficulty level is beginner-friendly. If you cover the basics of preparing the water and observing the fish daily, even first-time medaka keepers can get started with ease.

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. They are compact, but a container with plenty of water volume is recommended to keep water quality stable.

Q.How long do they live?

A.There is little documentation on the lifespan of Sasha Medaka, so we cannot give a reliable figure. Keeping the water well managed and watching your fish daily is the foundation for keeping them healthy over the long term.

Q.Does the black fade in a white container?

A.Sasha shows little background-color response, so the black tends not to fade even in a white container. Color expression varies between individuals, though, so check photos before you bring one home.

Q.Can I keep them with other medaka varieties?

A.Medaka are generally gentle, so keeping them together is usually possible. However, if they breed in the same container, the offspring may mix traits from other varieties, so keep Sasha separate if you want to preserve its characteristics.

Useful tools for Sasha Medaka care

Learn more about Sasha Medaka in the encyclopedia

More in this category