Gamma frozen food pack are gamma irradiated and this eliminates any risk of introducing harmful parasites or pathogens into your fish tank. Gamma irradiated foods are safe for re freezing without any risk of deterioration or unhealthy bacteria growth. The food is safe to store in your freezer. They are made from 100% natural products and the wide variety available ensures that individual species of fish receive a balanced, varied and interesting diet. A quick and convenient way of feeding fish.