This is a very interesting and serious topic. I live in New Zealand where we are meant to be surrouded by pristine (almost !) waters. I will do some research down here . We eat tinned salmon because we cannot afford fresh and tinned tuna also because fresh fish is very very expensive. We would much prefer to eat deep sea fish, like schnapper and Chatham Island Blue Cod. I think that the exact state of the fish is going to be very difficult to prove precisely. When I go fishing I eat fish raw...no marinades..straight out of the sea. But I am turning away from fish anyway