The question of how it affects the fishing is an interesting one.
As for the fish themselves, I would think they would just avoid the polluted water. No doubt they can sense the bad water and avoid it as they would water with low oxygen or whatever.
The question I would ask is the effect on the whole ecosystem. Will the area become a "dead zone" for some time. Does the oil coat the seafloor and kill the smaller organisms and the plant life and the crustaceans/shellfish? All the things that make the area attractive to baitfish and the predators.
This is a real shame... hopefully those responsible will be held accountable and will be charged with the cleanup asap.
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