First, how to choose koi. The selection of Koi can be based on certain criteria. Since ancient times, the judging criteria for Koi has been to adopt a system of 50 points in appearance, 30 points in color, and 100 points in 20 points. The recent development is a 30-point gesture, with a color of 20 points, a pattern of 20 points, a quality of 10 points, a grade of 10 points, and a style of 10 points in the 3-2-2-1-1-1 system. Among them, posture includes swimming posture and body shape, and genetic factors predominate; while color and pattern are beautiful, its own quality accounts for 70%, water quality accounts for 20%, and feed accounts for 10%. Therefore, improving water quality is particularly important for the enhancement of Koi. The so-called excellent water quality is pH 7.2 ~ 7.4 iron ions, chloride ions, sulfuric acid ions and other content, low hardness, rich in dissolved oxygen, while the feed is rich in color-increasing substances such as Spirulina, Antarctic scale shrimp, lotus root powder, shrimp, shrimp Or artificial colors. Second, how to identify the male and female koi. The abdomen of the female fish is larger than that of the male fish; the female of the anus is nearly flat and round, and the male fish is small and oval-shaped. When the male reaches the sexual maturity stage, there is a rough keratinous protrusion on the fins of the pectoral fin of the male.
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