Kathy, sorry your having problems this year but I know you don't mean it when you say you'll let them all die. We had anchor worms last year. Simple treatment is dimilin, worked great, if you want to catch them and give them a salt bath and hand pull the worms you can do that also. Don't know how they got in our pond either, someone told me they are always there, but then why don't I always have them on the fish?