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Neptune Medaka

The Neptune Medaka (Japanese name: ネプチューンメダカ) is a striking improved medaka strain developed by Medakaya Savannah (メダカ屋サバンナ) in Saitama Prefecture, Japan. First released in July 2023, this line was created through the intentional crossbreeding of multiple signature strains to achieve its defining traits: a rich, deep blue body and layered reflective expression. The Neptune Medaka embodies a balance of elegance and depth—its complex coloration and reflective quality stand out in both sunlight and artificial lighting. It is ideal for hobbyists seeking a modern, blue-toned medaka with high visual impact and selective breeding potential. Learn more about the Neptune Medaka on our Medaka Encyclopedia page.
  • Creator: Medakaya Savannah (Saitama, Japan)
  • Release Year: July 2023

 

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.
Title: Trio (2 Females and 1 Male)

Get more, save more! 🎉

Buy quantityDiscount
Buy 2 - 3Get 5% off
Buy 4 - 5Get 10% off
Buy 6+Get 15% off
$85.00
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
Jennie

I was concerned about our temperatures being in the upper 90s this week, but they arrived healthy and thriving! There was even an extra fish in there (I expect in case they did not fare well in the heat) but the temp inside the box was perfect. All the fish are happy, adorable and doing well in their new forever home. Many thanks!

S
Sathit

Very young healthy and color fish. Look exactly like the pictures definitely going to buy more different strain