A simple solution, don't feed it fish. Fish are not a necessary part of a snapping turtles diet. Fish when delivered from frozen stock, lack the vitamins of fresh, live fish and with fresh live fish, you run the risk of passing worms on to the turtle. All fish seem to stink up the water if any degree of tearing is going on.
I feed my snappers chicken gizzards (cut in pieces that won't have to be torn and foul the water), Beetles, Preying Mantis', frogs, aquatic snails (with the shells), shell fish ~ soft shelled clams and Mussels (with the shells), whole mice (suitable in size to swallow whole), occasionally smaller turtles, small snakes, you get the idea! Pretty much anything made of meat can be substitued for fish as long as you consider at least one type of whole vertebrate animal occasionally for other specific nutrients.
Take it easy, Leo
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