Youkihi Long-Fin
Youkihi Long-Fin combines the vivid vermillion-red coloring of the classic Youkihi medaka with elegantly elongated fins. Viewed from the side, the flowing fins create a striking, graceful silhouette as the fish swims. Fin shape varies by individual — some show the "Matsui" long-fin form, others a swallow-tail type — adding variety and character to every tank. Because achieving strong fin development calls for some hobbyist experience, this variety suits intermediate keepers who enjoy watching a fish mature into its full elegant form over time.
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Youkihi Long-Fin key facts
- Care level
- Intermediate
- Lifespan
- 2-3 years
- Size
- 3-4cm
- Temperature
- 10-30°C (ideal 20-28°C)
- Diet
- Medaka pellets, daphnia
- Viewing
- Indoor tank side view highlights fin beauty
- Tank Mates & Compatibility
- The long fins are easily damaged and it swims slowly, so avoid mixing it with fin-nippers or overly active varieties.
- Flow
- Keep flow gentle to reduce fin stress
- Water Temperature & Quality
- Adapts to roughly 10-30°C with 20-28°C ideal. Prefers neutral to slightly alkaline water; regular water changes keep it clean.
- Diet & Feeding
- Feed medaka pellets as the staple with daphnia. Color-enhancing food brings out a more beautiful red.
- Breeding & Egg-laying
- Pairing parents with good long fins and red color maintains a beautiful line. Fin extension comes in types such as Matsui long-fin and swallow.
About Youkihi Long-Fin
A medaka variety pairing Youkihi's vivid vermillion-red with elegant long fins (Matsui or swallow-tail type); intermediate-level care, 2-3 year lifespan, adults reach 3-4cm.
7 things to know before welcoming a Youkihi Long-Fin
1Fins Take Time to Develop
The long fins grow gradually from fry to adulthood, and how much they extend varies between individuals. Some fish naturally develop shorter fins, so patience is part of raising this variety.
2Fin-Nipping Risk in Mixed Tanks
Long fins can be nipped by tankmates and take a while to recover. Avoid overcrowding, and if keeping them with other fish, choose compatible tankmates and watch stocking density.
3Keep Water Flow Gentle
Long fins create drag, making strong currents tiring to swim against. Adjust filter outflow to a gentle setting so the fins aren't stressed.
4Matsui and Swallow-Tail Types
Fin shape varies between the Matsui long-fin form and the swallow-tail type, giving each a distinct look. It's worth checking which type you're getting so you know what to expect as it matures.
5Stable Water Quality Matters
Keeping the fins looking their best depends on stable water conditions. They prefer neutral to slightly alkaline water, so regular water changes and consistent filtration help prevent fin damage.
6Set Up for Side Viewing
The breed's appeal comes from watching the long fins flow when viewed from the side. Arranging your tank or container to allow side viewing lets you enjoy this fully.
7Best for Experienced Keepers
This is considered an intermediate-level variety, so having some general medaka-keeping experience makes fin care easier. First-time keepers may want to start with a standard variety before moving on to this one.
Frequently asked questions about Youkihi Long-Fin
- Q.Is Youkihi Long-Fin suitable for beginners?
- A.It's generally considered an intermediate-level variety. Having some basic medaka-keeping experience first makes caring for the fins easier.
- Q.How long do they live?
- A.They typically live around 2-3 years. Lifespan can vary depending on the care environment.
- Q.How big do they get as adults?
- A.Adults typically reach about 3-4cm. Fin length varies between individuals.
- Q.What fin shapes are there?
- A.There are two main types: Matsui long-fin and swallow-tail. Each has a different fin growth pattern and overall look.
- Q.Can they be kept with other medaka?
- A.Because their long fins are easily damaged and they swim rather slowly, avoid keeping them with fin-nipping fish or overly active varieties. If you do mix them, avoid overcrowding and pay attention to compatibility and stocking density.
Useful tools for Youkihi Long-Fin care
Learn more about Youkihi Long-Fin in the encyclopedia
View Youkihi Long-Fin encyclopedia entry →
Care difficulty, lifespan, size and diet — all basics covered.
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