Yea I had to do a presentation of food labeling (in the EU I should add). And let me tell you, the fish labelings are bullshit. I mean msc and the other one. They have shit rules that are not even enforced. There have been cases of forced labour on ships that work for msc companies. They also do nothing to protect the sea or the environment at all.
The best labels are the V labels and the EU label. V has strict rules and is known for barging into food productions to check for quality and environmental impact. EU labels are the absolute standard for all products. So although the requirements are not that high they improve the quality of food in Europe and of course sue every company that does not comply.