Koi - A Handbook on Keeping NishikigoiBoek in vrijwel nieuwstaat Keeping koi sometimes called 'living jewels' but more properly known as nishikigoi is a popular hobby in many parts of the world. Koi were developed in Japan over centuries through the selective breeding of different varieties of carp. The 15 recognized koi varieties present a spectacular array of coloursand markings. There is a perception that koi are priced out of reach of the average person, but it is quite possible to