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Figure 5. Primary production in the World’s oceans provide a quite similar pattern to the World’s fisheries (see Figure
6), concentrated along the continental shelves.
Figure 4. The continental shelves and under-water mountain ranges, so called seamounts (light blue shaded areas),
are of immense importance to fisheries.
Indeed, over half of the World’s marine landings are associated with ca 7.5%
of the oceans, concentrated on the continental shelves.