Koiinvärvi

Koiinvärvi is a term used to describe a specific color variation found in certain ornamental fish, most notably in koi carp. It refers to a vibrant, almost iridescent orange-red hue. This color is highly prized by breeders and enthusiasts for its intensity and its ability to complement other colors present in the fish's scales, such as white or black. The term itself is derived from the Finnish word "koi" meaning carp and "värvi" meaning color.

The development of koiinvärvi is a result of selective breeding over generations. Genetic factors play a crucial role in determining the pigment production and distribution within the fish's skin. While the exact genetic mechanisms are complex, they involve genes that influence the synthesis and deposition of carotenoids, which are natural pigments responsible for the red and orange coloration. Environmental factors, such as diet and water quality, can also influence the vibrancy and depth of this color.

Koi with a pronounced koiinvärvi are often considered to be of high quality and can command significant prices in the market. This color is a key characteristic in several popular koi varieties, including the Kohaku (white with red markings) and the Showa Sanshoku (black with red and white markings), where the quality of the red is a critical judging criterion. The pursuit of perfecting this specific shade of orange-red continues to be a significant aspect of the hobby of koi keeping.