Kohaku Koi
Kohaku is the first and greatest koi variety - pure white skin carrying red (hi) patterns, the standard against which all koi are judged.
🗓️ Last reviewed: July 2026
Overview
Kohaku is the first and greatest koi variety - pure white skin carrying red (hi) patterns, the standard against which all koi are judged. 'Koi keeping begins and ends with Kohaku,' goes the Japanese saying: beginners buy one first, masters spend lifetimes chasing the perfect one.
Natural History
The founding variety of modern nishikigoi, fixed in 1890s Niigata, Japan from red-and-white mutations of food carp; every koi show's Grand Champion lineage runs through Kohaku.
Appearance
To 60-90 cm in ponds; snow-white base with crimson patterns - judged on the red's depth and edges (kiwa), the white's purity, and pattern balance nose-to-tail. Classic patterns have names: nidan (two-step), sandan (three-step), inazuma (lightning).
Tank Size & Setup
A pond, full stop: 5,000+ liters for a few koi, 1+ meter deep, with serious filtration - koi are big, social, messy carp that live decades. Netting against herons; plants are salad, not decor.
Water Parameters
4-25°C seasonal range handled easily; the real requirements are volume, oxygen, and filtration turnover. Koi survive winters iced-over given depth and an air hole.
Diet
Quality koi pellets seasonally adjusted (wheat-germ in cold, growth food warm), plus treats - they hand-tame delightfully and beg like retrievers.
Health & Lifespan
Average lifespan is 25-40 years. 25-40 year lifespans are normal, legendary individuals far older; health is pond health - quarantine newcomers, watch for parasites and KHV (buy from reputable dealers).
Pros & Cons
Pros
- The definitive koi - timeless
- Hand-tames and greets you
- Extraordinary lifespan
- Entry point to a deep hobby
Cons
- Needs a real pond and budget
- Show-quality costs like art
- Herons agree they're visible
- A decades-long commitment
Kohaku Koi - frequently asked questions
Why do koi cost from $20 to $100,000?
Breeding lottery: thousands of culls produce one show fish with perfect skin, pattern and body. Pet-grade Kohaku share the bloodline and 95% of the joy.
What makes a good Kohaku?
Thick even red with razor pattern edges, porcelain white with no yellowing, and balanced pattern distribution - plus body conformation above all as the fish matures.
Do koi really live 40+ years?
Routinely, in good ponds - and famous fish (Hanako's claimed 226 years aside) verifiably pass 50. Plan for succession, genuinely.
🧠 Test yourself: guess the fish
Three clues from our quiz bank, each about another of our fish. Can you name them?
Clue 1.This dazzling Amazonian schooling fish wears a full-length red stripe beneath its blue band, distinguishing it from a similar smaller cousin.
It's the Cardinal Tetra - read the full profile →
Clue 2.Renowned for intelligence and complex breeding behavior, members of this freshwater group are a textbook example of explosive evolutionary radiation.
It's the Cichlid (Overview) - read the full profile →
Clue 3.A popular tank-cleaning bottom dweller from South American rivers, it rasps biofilm with a suckermouth and enjoys driftwood to graze.
It's the Bristlenose Pleco - read the full profile →