Louisiana fish deaths raise oil spill questions, BBC, September 15, 2010:
Ed Overton, an environmental scientist at Louisiana State University, said warm temperatures and a lack of wind can rob water of oxygen and in turn cause fish kills in late August and early September. ...
"It is improbable, not impossible, that this is the result of oil toxicity," Mr Overton said.
"The oil that's in the shoreline right now doesn't have a lot of the volatile components."
But Mr Overton conceded that bacteria in these types of waterways can use up oxygen when degrading oil, which can then affect fish.
Read the report here.
"Ed Overton [is] a Louisiana State University chemist who has analyzed the spill for NOAA," MSNBC reported this week