Seafood processed by regional, national, and international processors is usually bled later and goes through heavy equipment that lowers the quality of and firmness of the meat. Not only that, it typically has been on the boats longer, held at a processing location longer, and then sits in a seafood display or in a package at the supermarket before you buy it.
If you don't want to compromise on quality and if you want to support the communities that catch your fish, cut out the middlemen and buy directly from the people who caught the fish.