Fishmeal contains typically 60% to 72% protein, 10% to 20% ash and 5% to 12% fat, which is high in the health promoting omega-3 very long chain polyunsaturated fatty acids EPA and DHA, often referred to as 'omega-3s' (producers can supply details of the type of raw material used and expected nutrient content).

The high quality and concentration of essential nutrients, especially of well-balanced amino acids, essential fatty acids, and energy content makes fishmeal an indispensable ingredient in diets of most aquaculture species and many land-farm animals.