Shiro Utsuri, one of the most common and popular a number of the Utsurimono household, are koi which has a black base and parts of white pattern overlaying the black. To transfer new koi into the aquarium, float them while in the water within their bag for around 10 minutes https://israelnzjsa.bcbloggers.com/33656258/everything-about-hi-utsuri-koi-for-sale