45% Protein...Aqua Max brand fish diets are a new line of 100% nutionally complete diets that have been collaboratively developed by our nutrionists and fish experts. These products have been formulated for optimum nutient delivery to a wide number of fish species. With complete nutrition , fish have better performance and maintain good health and resistance to disease. AquaMax products are formulated to be high-energy, nutrient dense diets. Info from PMI Nutrition.