Overfishing has depleted fish-stocks the world over. Subsidies and lack of enforcement of sustainability measures drive the fishing industry to deplete the very stocks on which its existence depends, while climate interference and global contamination are leaving oceans so hypoxic (oxygen deprived) they cannot support marine life. At least 405 such ‘dead zones’ have been identified across the globe.
According to a NASA report, hypoxia is so extreme in some areas, that total anoxia (zero oxygen availability) can be found, allowing for no animal life to exist. In the Mississippi River delta, feeding into the Gulf of Mexico, it is thought that agricultural waste is creating a glut of nutrients for phytoplankton, which leaves excess organic matter for bottom-dwelling bacteria to feed on.