Simple definition: Koi are a domesticated, ornamental variety of carp, bred for color and pattern rather than food production.
Detailed Explanation
Koi are popular in ornamental backyard ponds and can live for decades under good care. They’re hardier than many ornamental fish but still sensitive to poor water quality, and they grow considerably larger than most people expect.
Why It Matters
Koi ponds are usually built and stocked differently from food-production ponds, with more emphasis on filtration, depth for winter survival, and water clarity.
Practical Example
A koi bought at 4 inches can grow past 24 inches, which changes filtration and stocking needs significantly over a few years.
