There are two distinct kinds of FUKURIN. They are referred to as type 1 and a type 2. See the attached images. FUKURIN only exists on scaled koi. However, small koi don't seem to show it. FUKURIN becomes more apparent as the koi matures. Koi older that three years can show FUKURIN and it is easily seen in koi exceeding 65 cm. Doitsu koi never exhibit FUKURIN.
It knows the structure of the scale and the skin by knowing FUKURIN. Then, the actual understanding of SASI and KIWA is made. Don't you think that it is interesting to know FUKURIN? Even if it faces 6000 people who read a KOI USA magazine with pleasure, we (KOISTAFF) think that an interesting commentary can be done. The picture of "FUKURIN Type 1" is sent.
Translation by Spike Cover
By knowing the nature of FUKURIN, one comes to understand the nature and structure of the scales and the skin. Then, one is able to understand of how SASHI and KIWA are formed. Don't you find knowing the about FUKURIN is interesting? The members of the KOISTAFF believe that a commentary can be done which will interest the 6,000 people who enjoy reading KoiUSA magazine. Attached, is a picture of Type 1 FUKURIN.