Green Light (Dark Type) Medaka
The Green Light Dark Type (Black & White) Medaka (Japanese name: 緑光黒白メダカ, house name: 緑光黒白式 / Ryokkou Kokubyaku-shiki) is a striking variety within the broader Green Light (緑光 / Ryokkou) lineage, known for its vivid and clearly defined external light (体外光 / Taigaikou) expression.
Considered an upgraded form of Kuro Ryokkou (くろりょっこう), it offers enhanced clarity and contrast in its shimmering shine. The original medaka was sourced from Wakaba Medaka and later bred by SNR. It also carries the nickname “Light Saber Medaka,” personally given to highlight its luminous quality when viewed from above.
This variety was first brought to the US in spring 2024, with sales beginning in the summer of the same year. Today, the medaka offered are US bred by SNR USA, ensuring healthy, well-acclimated stock for American hobbyists.
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.
Get more, save more! 🎉
| Buy quantity | Discount |
|---|---|
| Buy 2 - 3 | Get 5% off |
| Buy 4 - 5 | Get 10% off |
| Buy 6+ | Get 15% off |
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Important Information
Important Information
Imported in Fall 2024 and Spring 2025. All options currently available are U.S.-bred.
Our fish are raised outdoors in North Carolina, under natural sunlight.
As of September 2025, outdoor temperatures range from the 60s to mid-70s (°F), with a stable pH around 7.
Shipping Information
Shipping Information
Live Fish Shipping Rates (Flat Rate – Continental U.S. Only)
To make things easier and ensure your medaka arrive safe and sound, we've introduced a flat rate shipping system so you can shop without worrying about complicated or unexpected shipping costs.
| Box Size | Max Fish | Max Pairs | UPS 3 Day Select | UPS 2nd Day Air | UPS Next Day Air |
|---|---|---|---|---|---|
| Small | Up to 10 fish | Up to 5 pairs | $19.99 | $22.99 | $57.99 |
| Medium | Up to 20 fish | Up to 10 pairs | $25.99 | $34.99 | $59.99 |
| Large | Up to 30 fish | Up to 15 pairs | $34.99 | $47.99 | $83.99 |
Additional Notes:
- Hawaii & Alaska: Excluded from flat rate shipping.
- $3 packing fee per order – includes insulation, styrofoam box, and materials
- Dry goods ship free when purchased alone. If combined with live fish, only the live fish shipping rate applies.
- No USPS – we use UPS only for all live fish orders.
- Free shipping on orders over $500
- All live fish orders are covered by our DOA guarantee, regardless of shipping speed
- Local pickup is free but must be pre-arranged before purchase
Shipping Schedule:
- We ship only on Mondays and Tuesdays to minimize weekend delays.
- Orders placed after Tuesday 12 PM EST will be shipped the following Monday.
Delayed Shipment Claim:
If your package arrives later than your selected UPS service, you may file a claim with UPS. Please take photos of the shipping label and the box and email them to snrmedaka@gmail.com.
Dry Goods Free Shipping:
Dry goods are shipped via USPS Ground or First Class, depending on the total weight. If you need faster delivery, you may request expedited shipping for an additional fee. Please contact us via email to arrange upgraded shipping: snrmedaka@gmail.com
