Dead Zones
Dead zones are areas where the sea floor has little to no dissolved oxygen. These areas are often found at the mouths of large rivers, and are caused primarily by fertilizers that are being carried in the runoff. Unfortunately, the lack of oxygen kills many creatures and destroys entire habitats. At our current rate, dead zones will increase by 50% before the end of the century.
Currently the most notorious dead zone is a 22,126 square kilometre (8,543 mi²) region in the Gulf of Mexico, where the Mississippi River dumps high-nutrient runoff from its vast drainage basin, which includes the heart of U.S. agribusiness, the Midwest. The drainage of these nutrients are affecting important shrimp fishing grounds. This is equivalent to a dead zone the size of New Jersey. A dead zone off the coast of Texas where the Brazos River empties into the Gulf was also discovered in July 2007.
Come back each day this week to read up while we countdown to the #1 issue our oceans are faced with.









