Kissing Wide Fin Medaka

Kissing Wide Fin Medaka key facts

Care level

Advanced

Lifespan

2-3 years

Size

Up to about 4cm SL

Temperature

18〜28℃

Diet

Prepared medaka food, green water

Lighting

The feathery fins shine white because guanine gathers there, so the trait reads best from the side at an angle where light catches it. For Marriage Longfin, the Medaka Web Encyclopedia quotes a seller's blog saying a white or clear container is preferable. Outdoors, summer sun raises water temperature sharply, so shade half the container with something such as a reed screen.

Diet & Nutrition

Commercial prepared medaka food is the staple, given in an amount finished within a few minutes. Leftovers decay and foul the water, so adjust the quantity. Green water rich in phytoplankton suits fry rearing.

Water Temperature & Quality

Slightly acidic to slightly alkaline water is considered ideal, and the water drifts toward acidic as keeping continues. Around one water change per week is the guideline, and because sudden shifts in temperature or pH cause stress, acclimatise new fish by floating the bag. FishBase records the wild water chemistry of this species as pH 7.0-8.0 and hardness 9-19 dH.

Tank Mates & Compatibility

Elongated fins are easily damaged by obstructions or crowding, so keep the container uncluttered and the stocking light. A peaceful schooling fish, normally kept as a group of the same variety. One litre of water per fish is the guideline against overcrowding; overstocking causes poor growth, reduced breeding, oxygen shortage and water fouling.

Breeding

The Medaka Web Encyclopedia states of Marriage Longfin that not every fish develops fusahire even when the keeping conditions are met. Outdoors the spawning season runs from about April to October, once water reaches 18C or above with 12-13 hours of daylight. For year-round indoor breeding, 25-28C water and over 13 hours of lighting are the guideline. Eggs hatch at a cumulative 250 degree-days, about 10 days at 25C.

Health & Notes

The Medaka Web Encyclopedia notes that Marriage Longfin, the parent form of this variety, is a fish whose finish depends on its keeping environment, and quotes a seller's blog recommending water above 28C with room to spare, about five fish per 13 litres, and a white or clear container. The same source cautions that meeting those conditions does not make every fish develop fusahire. The extended, branching fins damage easily, so keep the container uncluttered. Outdoors the fish become inactive and overwinter near the bottom as water cools, resuming activity in spring once daytime water exceeds 10C. A 0.3-0.5% salt bath is used for ailing fish, with water raised to no more than about 28C.

About Kissing Wide Fin Medaka

Kissing Wide Fin Medaka: a 2021 Mariage Long Fin variant with dramatically flared, feathery white fins. An advanced-level variety reaching about 4 cm.

7 things to know before welcoming a Kissing Wide Fin Medaka

1. 1Large, Flowing Fins

   The defining trait of the Kissing Wide Fin Medaka is its widely flared dorsal and anal fins, with elongated, branching rays that create a soft, white, feathery look. It's a wide-fin variant of the Mariage Long Fin line, developed in 2021 by Masaharu Tarumi, and the fins ripple beautifully as the fish swims.

2. 2Best for Experienced Keepers

   Because the oversized fins are easily damaged by water flow or physical contact, this variety is considered an advanced-level fish. It suits keepers who are comfortable with careful water quality management and regular fin condition checks.

3. 3Choose Tankmates Carefully

   The Kissing Wide Fin Medaka itself is calm and peaceful, but its large fins can attract nipping from more aggressive species, so choose tankmates with care. Keep the tank free of sharp decor or rough materials that could snag or tear the delicate fins.

4. 4Keep Water Flow Gentle

   The long, flowing fins struggle against strong currents, which can hinder swimming. Setting the filter to a gentler flow, or adding a way to soften the current, helps the fish move comfortably.

5. 5Compact Adult Size

   Even at full growth, this variety stays compact at up to about 4 cm (standard length), similar in size to typical medaka. Its generous finnage makes the whole fish look more dramatic without added bulk.

6. 6Mariage Long Fin Lineage

   The Kissing Wide Fin Medaka is a wide-fin type within the Mariage Long Fin line, bred in 2021 by Masaharu Tarumi. Knowing this lineage helps in understanding how it compares to other long-fin medaka varieties.

7. 7Prepare Before You Bring One Home

   Since the fins are delicate, it helps to set up tank layout, water flow, and tankmates in advance of bringing this variety home. Watch it closely while it settles into its new environment.

Frequently asked questions about Kissing Wide Fin Medaka

Q.Is the Kissing Wide Fin Medaka suitable for beginners?

A.Because its large fins are easily damaged, this variety is considered better suited to experienced keepers. It helps to have some basic medaka-keeping experience before bringing one home.

Q.How big does the Kissing Wide Fin Medaka grow?

A.Adults reach up to about 4 cm (standard length), which is in the typical range for medaka. Its generous fins make the fish appear larger and more dramatic than its body size alone.

Q.What does "Wide Fin" in the name refer to?

A.Wide Fin refers to the underlying trait of a broad caudal peduncle and a high number of rays in the anal and dorsal fins. The soft, feathery white look comes from the fin rays branching and collecting guanine (fin shimmer), a trait known as fusa-hire. This variety is a wide-fin type of the Mariage Long Fin line, bred in 2021 by Masaharu Tarumi.

Q.Can it be kept with other medaka?

A.Its temperament is calm, but the large fins can be nipped by more aggressive tankmates, so choose companions carefully. Smooth, snag-free decor also helps protect the delicate finnage.

Q.Are there any legal restrictions on keeping this variety?

A.The Kissing Wide Fin Medaka is not subject to CITES.

Useful tools for Kissing Wide Fin Medaka care

Learn more about Kissing Wide Fin Medaka in the encyclopedia

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