Dead zones in the GOM

This season's massive, once-in-a-lifetime flooding of the Mississippi River is going to have an aftereffect that I have heard no one discussing yet. The massive flooding is going to wash untold amounts of pesticides, fertilizers and topsoil downstream into the Gulf of Mexico (GOM).
Info on the GOM dead zones here.

The dead zone in the GOM is already one of the largest in the world. This spring's flood is probably going to exponentially increase the size of that dead zone. The poor residents of Louisiana, and especially New Orleans, are going to suffer yet another blow when the flooding finally resides. As if Hurricane Katrina and the Deepwater Horizon oil spill were not enough to kill off Louisiana's fishing industry, this years floods might just finish the job.

A sample here.