'Dead zones' found in Atlantic open waters: Moving west, could lead to mass fish kills

Researchers have discovered areas with extremely low levels of oxygen in the tropical North Atlantic, several hundred kilometers off the coast of West Africa. The levels measured in these 'dead zones' are the lowest ever recorded in Atlantic open waters. The dead zones are created in eddies, swirling masses of water that slowly move westward. Encountering an island, they could lead to mass fish kills.