A mystical medaka with glittering lame on a black body, like stars in the night sky.
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Kuro Rame is an ornamental medaka variety developed through selective breeding in Japan, derived from the broader lame medaka lineage. Its most defining feature is the presence of lame scales — highly reflective scales scattered across the entire body — which create a brilliant, shimmering effect that shifts with the angle of light. The contrast between this luminous sparkle and the deep black body color is especially vivid, reminiscent of stars against a night sky. Temperamentally, Kuro Rame are calm and sociable, coexisting well with other medaka varieties, which makes them a popular choice for both beginners and experienced keepers. They adapt readily to various environments, from outdoor biotopes to indoor aquariums, offering versatile appeal. Adults reach 3–4 cm in length and, with proper care, can live for 2–3 years.
1Lame Shines in Light
The lame scales on Kuro Lame shift dramatically depending on the angle and intensity of light. An LED light shining from above brings out the maximum shimmer from the scales. Using a black or dark navy background in the tank will make the lame contrast stand out beautifully.
2Keep Water 16–28°C
Like most medaka, Kuro Lame thrives in water temperatures between 16–28°C. In summer, watch for temperature spikes caused by direct sunlight; in winter, ensure the water does not freeze completely. Sudden temperature changes can cause stress and illness, so always match water temperatures before performing water changes.
3Peaceful and Community-Friendly
Kuro Lame has a gentle temperament and does well in community tanks with other medaka of similar size or small, peaceful fish. Avoid housing them with fish small enough to be eaten, and keep fry in separate tanks. They are naturally schooling fish, so keeping five or more together allows for more natural behavior.
4Lame Expression Varies
The amount and intensity of lame on Kuro Lame varies considerably between individuals. Many fish develop more lame as they mature, which is one of the joys of raising this variety. If you are looking for a particularly high-quality lame specimen, choosing an adult or well-grown juvenile gives you a better idea of its final appearance.
5Feed Medaka-Specific Pellets
Use a medaka-specific formulated feed as the staple diet. Supplementing occasionally with live or frozen foods such as daphnia or bloodworms can support coloration and overall health. Feed once or twice a day in amounts they can consume within 2–3 minutes, and remove any uneaten food promptly to prevent water quality deterioration.
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Care difficulty, lifespan, size and diet — all basics covered.
6Water Quality Is Key
Kuro Lame is sensitive to declining water quality, and a buildup of ammonia or nitrite can quickly affect their health. Performing partial water changes of about one-third of the tank volume once a week helps maintain stable conditions. Installing a filtration system with established biological filtration reduces maintenance effort and keeps water cleaner longer.
7Breeding Is Relatively Easy
Kuro Lame typically begins spawning when water temperatures exceed 20°C, with the breeding season running from spring through autumn. Eggs may be eaten by adults, so it is best practice to move any eggs you find into a separate container. Newly hatched fry are extremely small and should be fed powdered fry food or finely crushed pellets.
