I have never noticed blood on any fillet I have ever eaten.Im too busy shoving them in my mouth.As far as the taste of frozen fillet's goe's I still stand by my claim of not rinseing and just filling the bag with water.My mom wont eat the just cleaned fillet's I give her until they have soaked in saltwater overnite,but she will eat them at my place and I never soak them to get the blood out.I promise if you have a fresh caught fish with blood on it when you fry them blood cannot be detected when done.I think this is an old wive's tale and no truth in it.If you do soak your's in saltwater dont forget to invite me to dinner.