Based on this, it sounds more like tuna is the only fish we know is mostly parasite-free, not the only fish that is mostly parasite-free. Perhaps most fish is a

Based on this, it sounds more like tuna is the only fish we know is mostly parasite-free, not the only fish that is mostly parasite-free. Perhaps most fish is actually parasite-free, but since we don't have enough evidence of that, the FDA is not going to allow selling it unfrozen.