A combination of Hikari Wheat-Germ and Hikari Spirulina will prepare your koi for reproduction. It’s important to note that when spawning occurs the oxygen level in your pond can be rapidly depleted by all the new fry taking their share. Also, adults will eat the fry as a natural response, if you want to avoid all the fry being eaten, remove them from your pond until they reach 1″-3″ depending on the size of your koi and your filter system.