But if it's rotten to the root, it's over When the fin rots due to bacterial infection, it is necessary to carefully cut off the thoroughly rotted part, which may cause bleeding in the process. Immediately apply mercuric chloride or oxytetracycline ointment to the wound to prevent secondary infection.

Koi fish belongs to CYPRINIDAE in biology, with more than 3,700 species in the world. It is a kind of advanced ornamental fish popular in the world today. It has the reputation of "living gem in water" and "swimming art".

Koi fish has a strong physique, bright colors, changeable patterns and beautiful swimming posture, which is of great ornamental and breeding value. Its body length can reach 1- 1.5 meters. Koi fish is distinguished by different colors, patterns and fish scales. Among them, koi fish, a butterfly, was successfully bred in 1980s and is famous for its long and smooth fins. It is actually a hybrid of koi fish and Asian carp, not a real koi fish. The colors of koi fish include one or more colors, including: white, yellow, orange, red, black and blue (light gray shadow caused by black under fish scales), and the colors are dull or shiny. Although the patterns vary endlessly, the best patterns are dots on the top of the head and stepped stones on the back. Fish scales may or may not exist; Big or small; Or have wrinkles, like "diamonds".