I bought a house last year, built a small pond about 4' x 5' and have a
couple koi and some other smaller gold fish, the fish lived through last
winter and all did well over this past summer, I hear about people have
breeding problems, too many fish etc.. how come my fish never bred, NOT
that I want any more fish, but I am curious.

I must have some combination of male/female fish with what I have, 14 in
all.

I know, small pond, too many fish, but the pond is clean, clear and the
fish are doing well.