As a lake ontario fisheman I have seen that way too many times, 20-25 years ago thats what was on every trout and salmon that was caught, or seen off the piers in Wilson or Olcott. They could hardly move, they would be belly up after being released, and hardly any fight when you caught them. That was back when the polution was bad. I have not seen any like that in several years though. The water is defentally cleaner then it was back then