I think the evidence is pretty clear that they are. It depends where you look, of course.
Historically, when science has been followed, and solid science has been followed, fish stocks were in pretty good shape. When politics gets in the way, and that's irrespective of whether it's NGO politics, government politics, or whatever, things go off the rails. I think the Atlantic cod collapse is an example of that. There are certainly problems in some places. The question is, what prescription fits the ill? Science gives us the answer, credible science, not agenda-based science, not hyperbole, but factual science.