Zoo Med Can O` Shrimp Zoo Med Can O' Shrimp (1.2 oz) are the latest in reptile nutrition and convenience. Our full line of feeder insects are cooked in the can (called "retorting") which locks in the flavor and freshness while also softening the exoskeleton for easier digestion. "Cooked in the Can" freshwater shrimp. Excellent high protein treat for aquatic turtles, amphibians, aquarium fish and invertebrates.