Observe the health level: No matter what kind of fish you buy, you should choose the one that is flexible in swimming, active in eating, well-proportioned and strong in posture, wide in shoulders and thick in mouth, and powerful in tail handle. If nothing else, as long as you are healthy, the feeding process will certainly relieve the troubles of diseases.
2. koi fish's body color: koi fish's body color requires only one thing, that is, strong and bright. White should be pure and warm, scarlet should be bright as blood, and ink should be thick and not scattered. For example, the red pigment in koi fish has a peach color, and its hair color is natural without the aid of coloring feed. If koi fish, who eats coloring feed and has a hair color, loses its color very obviously once it stops feeding coloring feed. To observe whether a koi fish has good genes, body color is a direct reflection.
3. Patterns: Looking at the patterns in koi fish, different varieties have made clear attention. For example, the scarlet color is not lower than the nose and not lower than the eyes; Dazheng's ink is not on the head, Showa needs to have a face cut and so on.
When buying small koi fish with a size of 3-1 cm, their body color is not obvious, and even some of them will bleed, so when we buy, don't buy small fry with vague colors, even if they grow up, they won't have good quality.
according to a fixed scoring scale, a koi fish can be scored as follows: posture 5 points, body color 3 points, and color 2 points. The so-called posture includes its health, beauty and ugliness, which is the standard to prove the advantages and disadvantages of genes, while body color and pattern are the embodiment of genes and later development, from which we can see whether the feeding is balanced, whether the water quality reaches the standard, whether the fish itself can maintain a good state and so on.