kappage

Kappage is a term that refers to the practice of artificially coloring or dyeing the hair of certain ornamental fish, most notably koi and goldfish. This process is typically done to enhance the visual appeal of the fish, making their colors more vibrant or creating patterns that are not naturally present. The dyes used are often non-toxic and are injected or applied in a way that is intended to be absorbed by the scales or skin of the fish.

The practice of kappage is controversial within the aquarium hobby and among fish keepers. Proponents argue that it can create unique and striking specimens, and that when done correctly with appropriate dyes, it does not harm the fish. They may point to the aesthetic value and the artistry involved. However, opponents raise concerns about the welfare of the fish. They argue that the dyeing process can be stressful, potentially leading to physical damage to the scales and skin, and that the chemicals involved could be harmful or toxic, even if claimed to be otherwise. There are also ethical considerations about altering an animal's natural appearance for human aesthetic purposes.

Many reputable breeders and aquarists strongly discourage kappage, emphasizing the importance of natural beauty and the health of the fish. The long-term effects of kappage on fish health and lifespan are not always well-documented, further fueling the debate. In some regions or competitions, kappage may be disallowed or frowned upon.