Crabs for sale at the Pike Place Fish ma

Crabs for sale at the Pike Place Fish market in Seattle, Washington state on March 22, 2011. Fish consumption reached record levels in 2008 and world stocks need to be urgently rebuilt, experts at the UN Food and Agriculture Organisation said in a recent report. The contribution of fish to global diets reached a record of 17.1 kilogrammes per person, "supplying over three billion people with at least 15 percent of their average animal protein intake,". Overall, fisheries and aquaculture support the livelihoods of an estimated 540 million people, or eight percent of the world population. AFP PHOTO/Mark RALSTON (Photo credit should read MARK RALSTON/AFP via Getty Images)