But it is not immune to diseases, in particular those associated with the skin and digestive tract. A sick fish can be easily spotted because it forsakes the normal gregariousness of carp to take up a solitary existence in one corner, often with its head drooping.
錦鯉像所有的動物一樣也會生病，最常患的是由於水質不乾淨而引起的皮膚病，偶爾也有胃腸不良。視別的方法很簡單，錦鯉是合群的動物，行動向來一致，如果魚兒得了病，便會自動離群，很自卑地獨自躲在角落上，頭朝下不會遊動。