Load video: Yellow Mariage / Yellow Mariāju Medaka

Yellow Mariage / Yellow Mariāju Medaka

Yellow Mariage / Yellow Mariāju (イエローマリアージュ)

Yellow Mariage — read as Yellow Mariāju in Japanese — is a yellow-toned line out of the Mariage family, carrying the line's body shine on a normal-finned body. The yellow comes up over the head and back and warms the blue-white shine underneath, so the fish reads gold in direct sun and closer to cream in shade.

The Mariage line was released by Masaharu Tarumi (垂水政治) of Ehime in June 2021, from Rinkō Long Fin (鱗光ロングフィン) × Morpho (モルフォ). Yellow entered the line through crosses with Emerald Fin (エメラルドフィン), and Japanese keepers write the resulting color as 黄青体外光 — yellow laid over blue body shine. Yellow Mariāju holds that coloring on standard finnage rather than the long-fin form.

Strain Name (品種名): Yellow Mariage (Yellow Mariāju)
Lineage: Mariage line (マリアージュ系), yellow expression via Emerald Fin (エメラルドフィン)
Key Traits: Yellow-blue body (黄青体色), dorsal shine (体外光), normal fins (普通ヒレ), normal scales (普通鱗)

Understanding Live Fish Options

Here’s a quick guide to help you choose the right option when purchasing live medaka from our shop. Sizes and sexing are carefully selected, but please note that fish may vary slightly by strain, age, and growth rate.

Juvenile (Unsexed)

Young fish, typically 1.0–2.5 cm in size. They are too early to sex and often have not fully developed their final traits yet. As such, they are not graded for color, pattern, or fin type at this stage.

Female

Confirmed female medaka, usually 2.5–3.5 cm. Selected by experienced staff, but please note that 100% accuracy cannot be guaranteed for younger fish.

Male

Confirmed male medaka, also typically 2.5–3.5 cm. Identified by fin shape and behavior, but final confirmation may develop with maturity.

Breeding Pair (1 Male + 1 Female)

One male and one female—ideal for those starting a breeding line or looking for a guaranteed pair.

Trio (2 Females + 1 Male)

One male and two females. This setup helps maximize egg production and is commonly used by breeders.

SS Grade Pair

A premium hand-selected male and female pair with top-level traits. These are our highest-grade specimens, chosen for exceptional color, form, and balance — ideal for serious breeders and collectors.

⚠️ Please note: Sexing is done to the best of our ability at the time of shipping. Juveniles cannot be sexed or graded for traits. Some strains—especially short-body types like Daruma—naturally grow smaller than standard-bodied medaka. In some cases, longfin or swallow-tail varieties may be difficult to sex accurately due to their flowing fins and slower development. If you believe there is an error in the sex of the fish you received, please don’t hesitate to reach out via our Contact Us page.

🐟 If your goal is serious breeding, we highly recommend purchasing multiple breeding pairs or at least two trios. Just like people, medaka have their own personalities and chemistry — and not all combinations will result in successful breeding. Having more than one group increases your chances of forming compatible pairs and achieving strong egg production.
Option: Female

Get more, save more! 🎉

Buy quantityDiscount
Buy 2 - 3Get 5% off
Buy 4 - 5Get 10% off
Buy 6+Get 15% off
$25.00
Tax included. Shipping calculated at checkout.
  • All photos shown are original images taken by SNR MEDAKA USA. Unauthorized use, reproduction, or distribution is strictly prohibited. Photos are for reference only — actual fish may vary.
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J
Joshua

Arrived a bit skinny from fasting on top of a 3 day travel , looking beautiful after a week of heavy feeding