Fisheries and aquaculture combined produce about 19% of animal-derived protein for human consumption globally. Aquaculture lags slightly behind the capture fisheries in the amount of edible protein produced, and it has not yet exceeded edible protein production by beef. The order of amounts of protein produced is the same for capture fisheries and aquaculture: fish > crustaceans > molluscs. Based on essential amino acid composition and digestibility, fish and crustacean protein are similar in quality to other animal-derived protein. Molluscan protein is somewhat inferior in quality to other protein sources. Resource use for a quantity of protein needed to contain the daily, essential amino acid requirements for the average human adult is compared for the different types of animal-derived proteins.