This is a recipe for generating pathogens.
I will not buy fish unless it is wild caught by American fisherman.
Some time ago, I read that fish that are farmed do not produce the omega fatty acids that are desirable in our diet. Instead, as they are fed the equivalent of junk food, they produce a less beneficial form.
They definitely are less tasty. I don't know if it would be possible to produce tasty farmed fish. It is obviously not necessary to feed them "junk food," but maybe it is not possible to compete economically with those farmers who do.