Is koi koi seven a hentai?

A fish, a variety of a carp. Most popular in home ponds.

A koi is a large and colourful Japanese carp.

Yes. In fact, the gene that controls the butterfly characteristic is a dominant gene so all the offspring will be butterfly.

Yes you can swim in it and they won't hurt you.

The koi eggs frtilized after they pushed out of the female koi. The male releases sperms in the water, the fertilized process occurs whithin five second after the eggs get pushed out of the femal koi.