The Gammarus is harvested from non-polluted rivers or lakes,which belongs 100% natural biology diet.Its processed by special drying and sterilization. The gammarus is suitable for feeding reptiles and all sorts of tropical fishes . The gammarus contains abundant protein,calcium and phosphorus,which can enhance the growth of reptiles and tropical fishes. The gammarus also comprises much more Vitamin C ,which can build up the body against many disease and increase the appetite of your pets. The gammarus willnot pollute the water quality of your aquarium tanks.