Massive Fish Kill in Gulf Caused by “Dead Zone,” Oil?

National Geographic: A huge fish kill in a Louisiana marsh was likely caused by annual low-oxygen conditions--but the Gulf oil spill may have been an additional "insult," experts say. The die-off occurred during a time of year when a giant low-oxygen "dead zone" regularly forms off the Gulf, according to Prosanta Chakrabarty, a fish biologist at Louisiana State University in Baton Rouge. Agricultural runoff into the Mississippi River contains nutrients that support the growth of oxygen-hungry ......

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