the resulting picture of the strains and stresses weighing on the ocean environment provides an important context for the subsequent chapters which assess the future development of a range of key oceanbased industries it provides seafood which is the primary source of animal protein in the diets of approximately billion people mostly in developing countries and it accounts for at least of the protein eaten by of the planet s human population fao seafood products account for of total agricultural food exports and of world merchandise trade in terms of their value