Krill Gold’s formula consist of 85-Percent Whole Antarctic Krill. Krill contains high quality protein, amino acids, vitamins, and minerals. It is also a natural source of carotenoids, which bring out the rich and vibrant colors of your fish. It also contains a high concentration of Astaxanthin which is a powerful natural pigment and antioxidant. Krill Gold can be fed to all types of fresh and saltwater fish.