"Gulf Fish Hammered by BP Oil"
"Even minuscule amounts of BP's crude oil has affected fish in profound ways in the Gulf of Mexico—even when oil in the water was nondetectable. This according to a paper in early view in PNAS (Proceedings of the National Academy of Science)."
"The problems showed up as genetic responses in liver tissue and as aberrant protein expression in gill tissues—and they lived on in fish even after their environment looked and tested clean."Source: Mother Jones, 09/27/2011