Right, the chemical and biological reactions that process crude into less hazardous substances are strongly temperature dependent. The warm Gulf waters process oil much faster than the waters off Alaska.
All the evidence I see suggests that the ecosystem is at least 90% recovered since the spill by whatever metric one wants to use: area, biomass, species. Detectable effects may linger for decades for the benefit of those who delight in working hard to find them and point them out. I can't see any big ongoing effects that most inshore fisherman should be very concerned about.
The fishing in Louisiana has been great since the spill. Get out and enjoy it.
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