There can be as little as one (if your mate is the same pattern type and color pattern as your own), all the way up to eight (if your mate is a different pattern type and completely different colors). You are then shown the offspring screen, where all of the possible outcomes of the breeding pair are shown.

It should be noted that the mate will never be faster than your koi, but can have a higher agility, making it difficult to keep up with a mate that twists and turns often. As you keep up, a large circle will start to form around the two fish. Te easiest way is to place your finger on the head of the mate, and slide it accordingly in order to follow it. You will need to direct your koi to stay as close as possible to the mate. It is also believed that too rapid a succession in leveling up will skip past the call for a mate. A mate will leave the pond as soon as the deed is done, and s/he is off screen for at least ten seconds, so swim to the opposite side of the pond as the mate. The number one reason for this is an opposing fish is still in the pond - either your previous mate fish (a rival) or your offspring from another mate (upstarts) are in the pond. Players have reported that a mate will not show up at this sweet spot. Then, at every half-level, the game will send another koi out into the pond to 'visit' with you. This should be a simple task, needing only a few minutes in the smallest pond to achieve. Before you can do anything with breeding, you need to get your koi fish to at least level four.

Koi fish slot machine game