Now, wouldso would you know if it can be a real koi? Other fishes may share the same trait so a really good inspection important to confirm if it is a koi or not. Perhaps one obvious thing to check is the scale. Try to make estimates in the photograph. Tend to be lucky if it is an entirely grown one since a grown-up thiet ke thi cong ho ca koi ke ho ca koi (www.heidelager.com) would reach up to 3 feet in length. This should make it easier to distinguish from regular fish. Begin to also look at the colors and pattern how the fish delivers.