I guess for me, there were so many more ways to use up extra fish than just killing them off. Well, let's say, even if I kill them off, they have more uses than just getting tossed in the trash (or even compost). At various times of the year, I have crayfish, turtles, ducks, etc for pets that would be just fine eating the extra fish! Hope you can find some ways like that for removing some fish from your pond.
A friend of mine told the same story about going on vacation and asking a friend to help top off his koi pond. The hose was left running longer than planned and all 20 of his koi fish died. Needless to say, he won't depend on that friend anymore for watching his pond on vacation.
