Koi
Cyprinus rubrofuscus
🌍 Overview
Koi are ornamental varieties of the Amur carp, developed in Japan starting in the early 19th century from food carp that displayed unusual color mutations. Breeders selectively refined these mutations into today's dozens of recognized color patterns - kohaku, showa, and sanke among the most prized - which are still judged competitively at shows in Japan. Koi are exceptionally long-lived and develop genuine recognition of individual keepers, often gathering at a pond's edge when a familiar person approaches.
📋 Quick Facts
Native Range
Japan (developed from Amur carp of East Asia)
Natural Habitat
Outdoor ponds and slow-moving freshwater systems; entirely domesticated as a pet
Adult Size
12-36 inches (30-90 cm) depending on pond size and variety
Wild Diet
Omnivorous bottom feeder - aquatic plants, insects, and crustaceans
Wild Lifespan
25-35 years typical; some documented individuals far longer
Conservation Status
Domesticated (not evaluated; wild ancestor Least Concern)
⚖️ Compare
Koi
Human
Adult Size
12-36 inches (30-90 cm) depending on pond size and variety
5-6 feet (150-185 cm); ~135-200 lbs
Wild Lifespan
25-35 years typical; some documented individuals far longer
~73 years (global average)
Wild Diet
Omnivorous bottom feeder - aquatic plants, insects, and crustaceans
Omnivorous - eats just about anything
Native Range
Japan (developed from Amur carp of East Asia)
Global - originated in Africa roughly 300,000 years ago
Natural Habitat
Outdoor ponds and slow-moving freshwater systems; entirely domesticated as a pet
Everywhere from arctic tundra to tropical megacities
Conservation Status
Domesticated (not evaluated; wild ancestor Least Concern)
Least Concern (8+ billion and counting)
🧠 Test Yourself
What's the Koi's native range?
📖 Care Guide
Koi Care Guide
The living jewels of the pond world that can genuinely outlive their keepers!
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🤓 Did You Know?
Koi are famously long-lived, with some individuals in Japan documented living well past 70 years and one famous fish, Hanako, claimed to have reached 226 years old (a figure that remains disputed among scientists but reflects just how extraordinarily long-lived the species genuinely can be). Koi also recognize individual people and will learn to approach a familiar keeper at the pond's edge for food.
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