I have been preserving leftover shinners and leeches from fishing trips for years. Take the shinners or leeches and soak in cheap vodka or wintergreen rubbing alcohol, strain and place in ziplock bags and into the freezer until you are going fishing. They stay soft never loosing scales and work sometimes better then the live ones. Leeches if trolling act like if they were alive. Walleye and perch love them.....