The World’s most productive fishing grounds are confined to major hotspots, less than 10% of the World oceans. The maps shows annual catch (tonnes per km2) for the World’s oceans. Notice the strong geographic concurrence of continental shelves, upwelling and primary productivity and the amount of fish caught by fisheries.
From collection: In Dead Water - Climate Change, Pollution, Over-harvest, and Invasive Species in the World's Fishing Grounds
Hugo Ahlenius, UNEP/GRID-Arendal