The ultimate immune boost with immunomodulator for top defence. Yugen is a complete koi feed with an additional bacterial immunomodulator having a matchless effect on the koi’s immune system. In young and growing as well as in mature koi administering Yugen will result in a well-developed and optimally functioning immune system in a very short time. This is expressed in an astounding growth, spectacular colouring and most of all in a strong improvement of the natural resistance. Feed Yugen instead of ordinary feed 4 times a year for 5 consecutive days, with intervals of at least 2 months and certainly shortly before and after the winter period.