Koi up to one year old ( Tosai) have a high metabolic rate and can digest up to 65% protein content. Look for a quality food with 40% protein content (fish meal based) and supplement the diet with Silkworm Pupae, crushed up. The balance of the ingredients needs to be perfect, otherwise they will grow “fat” and not length ways. The first year of a koi’s life is critical for future development.
The most common breeds of koi and how to identify them. Sanke, Showa, Ogon, Kohaku, and Chagoi all simply explained.