Whitefish is any of several deepwater fishes – common whitefish, lake whitefish, round whitefish and mountain whitefish. The clean tissue of undecomposed whole whitefish and/or whitefish cuttings is used. Whitefish is an excellent source of both protein and omega fatty acids. Whitefish naturally has EPA and DHA, omega 3 fatty acids which support skin and coat, immune system health and nervous system development and maintenance.