Doitsu Koi are a striking variety of koi characterized by their lack of traditional scales. Originating from German mirror carp, they showcase either a smooth, scaleless body or a line of large scales along the dorsal and lateral lines. Their unique appearance and bold color patterns make them standout fish in any pond.
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Doitsu Koi are a striking variety of koi characterized by their lack of traditional scales. Originating from German mirror carp, they showcase either a smooth, scaleless body or a line of large scales along the dorsal and lateral lines. Their unique appearance and bold color patterns make them standout fish in any pond.
Smooth, scaleless body or with a single row of large scales along the dorsal or lateral line. Patterns are sharply defined, and colors are vibrant. The absence of scales highlights the purity and intensity of their coloration.
25–35 years with excellent care; some can live over 40 years
Omnivorous – thrives on high-quality koi pellets, vegetables (lettuce, peas, spinach), fruits (melon, orange), and protein-rich treats like shrimp, earthworms, and silkworm pupae.
Doitsu Koi offer a unique visual appeal thanks to their scale reduction and defined color patterns. Ideal for koi keepers looking for variety and elegance, they are a modern favorite in koi competitions and personal ponds alike.
Moderate – hardy but scaleless body makes them more susceptible to skin injuries and parasites, requiring attentive care and pristine water.
500 gallons minimum for juveniles; adults thrive in large ponds of 1000+ gallons
7.0 to 8.0
5–15 dGH
59–77°F (15–25°C), adapts to seasonal temperature changes
24–36 inches depending on variety and pond size
Compatible with other koi varieties and large, peaceful pond fish like goldfish. Avoid aggressive or territorial species.
Avoid aggressive or fin-nipping species. Not suitable with overly territorial fish.
Cyprinus carpio
Cyprinidae
Japan – derived from German mirror carp introduced in the early 1900s
Highly social, thrive in groups of koi. Peaceful and interactive with other pond fish.
Feed 2–3 times daily during warmer months. Reduce feeding in cooler weather and stop below 50°F (10°C). A balanced diet of pellets, vegetables, and occasional live foods ensures vibrant color and health.
Egg scatterers – they breed in warm water (68–75°F), laying sticky eggs on aquatic plants or spawning mops. Adults must be separated after spawning to prevent egg predation.
Use spawning mops or aquatic plants to collect eggs. Ideal spawning temperature is 68–75°F. Eggs hatch in 3–6 days. Separate parents post-spawning. Feed fry with infusoria, then transition to baby brine shrimp.
pH: 7.0–8.0, Temperature: 59–77°F (15–25°C), Hardness: 5–15 dGH, Ammonia/Nitrite: 0 ppm, Nitrate: <40 ppm. Excellent filtration and oxygenation are critical.
More prone to skin infections, abrasions, and parasites due to lack of protective scales. Also susceptible to typical koi ailments like ich, ulcers, and KHV.
Docile, sociable, and confident. Doitsu Koi are interactive and enjoy swimming with other koi varieties.
Very friendly, inquisitive, and often the first to greet keepers at feeding time. Peaceful and harmonious in koi communities.
Doitsu Koi are descendants of German mirror carp introduced to Japan in the early 20th century. Their most defining trait is the reduced scale pattern – some have no scales, while others have rows of large, mirror-like scales along the lateral and dorsal lines. This feature highlights their vivid coloration and pattern definition more dramatically than scaled koi. Doitsu Koi appear in nearly every koi variety – including Kohaku, Sanke, and Showa types. They require high water quality to maintain their striking skin and pattern clarity. Their streamlined look makes them a favorite in competitive koi circles.