Mazuri Fresh Water Turtle Diet. Mazuri Fresh Water Turtle Diet. A floating diet designed for all life stages of fresh water turtles. Nutritionally complete-no vitamin or mineral supplements needed. Complete life cycle diet. Fresh Water Turtle Diet should be fed to juvenile or adult carnivorous turtles once a day, three to five times per week. For best results, feed only the amount of diet that the turtles will consume in one day. The diet should be scattered on the water, where it will float. Feed only as much as your turtle will readily consume.