Showa Sanshoku Koi Care Guide

The Showa Sanshoku koi (Cyprinus carpio), often simply called Showa, is one of the most dramatic and popular koi varieties in the UK. Known for its bold combination of black, red, and white, it creates a striking contrast in any pond.

In this guide, you'll learn everything you need to know about Showa koi care, including pond size, water conditions, feeding, compatibility, and typical UK prices - plus how to buy or sell them locally.

Quick facts about Showa Sanshoku Koi

Showa koi are one of the "Big Three" koi varieties (alongside Kohaku and Sanke). They are characterised by a black (sumi) base with red (hi) and white (shiroji) patterns layered over it.

Unlike Sanke, the black in Showa appears across the entire body, including the head.

Scientific Name

Cyprinus carpio

Average Size (when mature)

60-90 cm (can grow larger in ideal conditions)

Origin

Japan

Tank Size

1,000L+ (larger strongly recommended)

Lifespan

20-30+ years

Behaviour

Peaceful, social

Temperature

4-28°C (coldwater species)

Diet

Omnivore (koi pellets, vegetables, natural pond foods)

pH

6.5-8.0

UK Price

£40-£500+ depending on size and quality

How Many Showa Koi Should You Keep?

Showa koi are social fish and should be kept with other koi.

  • Keep at least 2-3 koi
  • Stocking depends on pond size and filtration capacity
  • Allow generous space per fish

Overstocking can lead to:

  • Poor water quality
  • Stunted growth
  • Increased disease risk

As with all koi, long-term planning is essential.

Ideal Pond Conditions for Showa Koi

Providing the right pond environment is key to maintaining both health and colour development.

  • Pond Size: Larger ponds (2,000L+) are strongly recommended
  • Depth: At least 1-1.5 metres
  • Filtration: Strong mechanical and biological filtration is essential
  • Water Conditions: Clean, stable, well-oxygenated water
  • Plants & Features: Marginal plants and shaded areas can reduce stress
  • Aeration: Air pumps or waterfalls improve oxygen levels

Stable water conditions are important for maintaining strong contrast between colours.

Compatibility with Other Fish

Showa koi are peaceful and mix well with other pond fish.

  • Good Tankmates: other koi varieties, goldfish, and peaceful coldwater species
  • Avoid: very small fish that may be outcompeted for food

They are non-aggressive but can be competitive feeders.

Are Showa Koi Easy to Care For?

Showa koi are moderately easy to care for with the right pond setup.

They require:

  • Large, well-filtered ponds
  • Stable water conditions
  • Regular maintenance
  • A high-quality diet

They are hardy, but achieving and maintaining top colour quality requires good care.

Showa Sanshoku Koi Price in the UK

In the UK, Showa koi typically cost between £40-£500+, depending on size, pattern, and quality. Show-grade or imported Japanese specimens can cost significantly more.

Prices vary depending on:

  • Balance and placement of black, red, and white
  • Depth and quality of colour
  • Size and age
  • Breeder and origin

They are one of the most sought-after koi varieties.

Where to Buy Showa Koi in the UK

Showa koi are available from specialist koi dealers, breeders, and pond centres.

Sourcing koi locally can:

  • Reduce transport stress
  • Allow you to inspect pattern and colour
  • Offer better value

TankMate UK helps connect pond keepers who want to buy, sell, or rehome fish safely - without shipping.

Find Showa koi for sale near you or list your own using TankMate UK.

Can You Sell Showa Koi?

Yes - Showa koi are commonly sold or rehomed by hobbyists and breeders.

Selling locally is often the best option, as it:

  • Minimises stress for the fish
  • Avoids the risks of transport
  • Connects you with knowledgeable buyers

TankMate UK allows you to list koi quickly and find local buyers.

Feeding Showa Koi

Showa koi are omnivorous and require a balanced diet.

Key Tips:

  • Feed high-quality koi pellets as a staple
  • Supplement with vegetables such as lettuce and peas
  • Adjust feeding based on water temperature
  • Avoid overfeeding

A good diet supports growth and helps maintain strong colour contrast.

Common Problems with Showa Koi

Colour imbalance or fading, often caused by:

  • Poor water quality
  • Low-quality diet
  • Genetics

Poor water quality, linked to:

  • Overstocking
  • Overfeeding
  • Inadequate filtration

Slow growth or poor condition, caused by:

  • Insufficient pond size
  • Poor nutrition

Why Showa Koi Are So Popular

  • Bold black, red, and white contrast
  • One of the "Big Three" koi varieties
  • Highly prized by enthusiasts
  • Dynamic patterns that develop over time
  • Striking centrepiece fish

When kept correctly, Showa koi offer dramatic visual impact and are a highlight in any koi pond.

Frequently Asked Questions

What is the difference between Showa and Sanke?

Showa have a black base colour across the body, including the head, while Sanke have white bases with black markings mainly on the body.

Do Showa koi change colour?

Yes, their patterns and colour intensity can develop as they mature.

Are Showa koi good for beginners?

Yes, they are hardy, but selecting high-quality specimens can be more advanced.

What pond size do Showa koi need?

At least 1,000 litres, though much larger ponds are strongly recommended.

Looking to Buy or Sell Showa Koi Locally?

TankMate UK connects pond keepers who want to buy, sell, or rehome fish safely within their local area.

Whether you're stocking your pond or passing fish on to a new home, you can:

  • Browse fish available near you
  • List your own fish in minutes
  • Avoid the risks of transport
Explore local listings with TankMate UK and find the right fish for your aquarium.