according to the "fishbase.org" website, there are 33,200 known fish species, many of which live in the oceans. many of these fish are a fine source of protein, so many people eat them. fishing industries is very important because they make jobs and give food to millions of people. today, usually through ocean fishing, the ocean supplies about 2% of the calories needed by people. tuna, anchovies, and herring are harvested close to the surface of the ocean. pollock, flounder, and cod are caught near the ocean floor. more than a million tons of herring are caught every year in the north pacific and north atlantic, and almost eight fish out of ten fish are eaten as food for humans. the other fish are used as fertilizer, glue, and pet and other animal food.