What is the Black Diamond Medaka?

Black Diamond Medaka (ブラックダイヤメダカ) is a premium ornamental rice fish created by Mr. Nakazato in Kanagawa Prefecture. It features a deep-black body, black fins and eyes, and lamé shine inherited from the Hoshikawa line (blue lamé Miyuki).

What is the origin of the strain?

The strain was created by crossing Orochi with Hoshikawa (blue lamé Miyuki) and completed at the F4 generation through selective breeding by its creator, Mr. Nakazato.

What does the purchase include?

Each order includes one male and one female Black Diamond Medaka, hand-selected for color and health.

What shipping method is required?

UPS 2-Day Air is strongly recommended. Our DOA (Dead-on-Arrival) policy only applies when this shipping method is selected.

Medaka Strain – Black Diamond Medaka

Bring dramatic brilliance to your medaka pond with the Black Diamond Medaka (Japanese name: ブラックダイヤメダカ) — a striking ornamental strain that combines the deep-black intensity of “Orochi” with the lamé sparkle of Hoshikawa lineage. This line was developed by Mr. Nakazato in Kanagawa Prefecture and completed by the fourth generation (F4) through meticulous selective breeding.

The Black Diamond Medaka inherits its dark body, black eyes, and fins from Orochi, while incorporating refined blue and silver lamé scales from Hoshikawa (blue lamé Miyuki). Thanks to carefully controlled pairings, this strain has a high fixation rate and consistent appearance across generations.

Learn more about the Black Diamond Medaka on our Medaka Encyclopedia page.

Includes: 1 Male + 1 Female
Key Traits: Jet-black body, black eyes and fins, vibrant lamé shimmer inherited from Hoshikawa
Creator: Mr. Nakazato (Kanagawa, Japan)
Lineage: Orochi × Hoshikawa (Blue Lamé Miyuki), fixed at F4
Shipping: UPS 2-Day Air strongly recommended

※ All photos shown are original images taken by SNR Medaka USA. Unauthorized use or reproduction is strictly prohibited. Photos are for reference only — actual fish may vary.

Important Purchase & Shipping Information

For customers who purchase physical Medaka:

As a general rule, we do not accept cancellations for medaka sold in-kind after the order is confirmed.
Please note that colors may vary depending on lighting and container background.
This item is not eligible for returns or exchanges.
We ship to the continental U.S. only. We do not ship to Hawaii or Alaska.

Shipping Information

Please select UPS 2-Day Air at checkout. Our DOA (Dead-on-Arrival) policy only applies to this shipping method. For full terms, visit our Shipping Information page.
Orders may be delayed or canceled if fish are not fit to ship at the time of packing. You will not be charged for canceled items.
We may combine multiple live fish orders for efficient shipping when possible.