GCRL - Parasitology
OIL AND WATER
============ DEEPWATER HORIZON - BP Oil Spill =================
------------------ OIL AND WATER DO NOT MIX -----------------------
Deepwater Horizon Oil Spill Impact
(1). Changes apparent and consistent between parasites of the Croaker (Micropogon undulatus) in oil-affected and unaffected areas.
(2). Prolonged bottlenose dolphin mortality five times normal yearly rate, and still on-going.
(3). Barataria Bay estuary shrimper reports (personal communication) no crabs, no white shrimp, no flounder and no speckled seatrout in repeated trawl drags.
(4). Oyster mortality (combination of fresh water and oil spill contamination) has forced the closure of the Mississippi season after just five days.
There are indicatiions that the dispersant used, against the recommendations of the EPA, induces high mortality in larval life forms at much lower parts-per-thousand concentrations than documented in MSDS tables.
Reportedly Corexit [dispersant by Nalco Chemical]may be toxic to marine life and helps keep spilled oil submerged. There is concern that the quantities used in the Gulf will create 'unprecedented underwater
damage to organisms.' Nalco spokesman Charlie Pajor said that oil mixed with Corexit is "more toxic to marine life, but less toxic to life along the shore and animals at the surface"
because the dispersant allows the oil to stay submerged below the surface of the water. Corexit 9500 causes oil to form into small droplets in the water; fish may be harmed when they eat
these droplets. According to its Material safety data sheet, Corexit may also bioaccumulate, remaining in the flesh and building up over time. Thus predators who eat smaller fish with the
toxin in their systems may end up with much higher levels in their flesh. The influence of Corexit on microbiological communities is a topic of ongoing research.
[source = Wikipedia article on "COREXIT DISPERSANTS"]
Change Date 12 November 2011
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Copyright 01 November 2011 Gulf Coast Research Lab,
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