Your koi fish are going to need your attention occasionally as they live in your water garden. Watching and examining the fish for any disfigurements, bulging and other problems can help you decipher what is going on with your fish in the water garden.
Your koi will need nutrition just as you do to become healthy adults. Fish need vitamin C, and a shortage of Vitamin C will make your fish to be disfigured. A fish that does not have enough Vitamin C will have muscle problems and their bodies will change to form an S shape, as the muscles in their body do not hold their shape.
complete article on koi nutrition here
