Superfish freeze-dried mysis shrimp are a natural source of protein and naturally contain chitosan, which supports a healthy immune system. Mysis shrimp make an ideal supplement for many freshwater and saltwater fish species. Freeze-drying perfectly preserves all nutrients and eliminates pathogens, making it a safe and nutritious food! Give your fish what they eat in the wild by combining freeze-dried food with their regular daily food to provide them with a varied diet.