In the Gulf of Mexico off the Louisiana coast there is the "dead zone". It is where there's too little oxygen to sustain marine life. Scientist have been measuring it on a regular basis. It was set this year to be of record size of roughly 7,800 square miles. It is based on the amount of fertilizer and nutrient pollution they are expecting. But hurricanes have a way of mixing in oxygen to the water. Apparently Hurricane Barry managed to add a little oxygen. Not enough to make the dead zone better but enough to slow its growth for a change.