Oil caused fish to grow an “extra fin” or other “rare mutations” says chemist who worked for NOAA during the Exxon Valdez

Deepwater Horizon: After the oil, Nature.com, September 1, 2010:

Excerpt

Rare mutations that caused salmon to grow an extra fin or an enlarged heart sac, for example, began to turn up in a small fraction of the population, says [Jeffrey Short, an environmental chemist based in Juneau, Alaska who worked for the National Oceanic and Atmospheric Administration during the 1989 Exxon Valdez disaster]... "It turned out to be an extraordinary impact."