Worldwide, we have a much bigger problem with toxins from algae in seafood than we had 20 or 30 years ago ... We have more toxins, more species of algae producing the toxins and more areas affected around the world.
But the problem goes deeper than that. For all of human history, people who live near oceans have sustainably harvested fish. In that context, fish represent a cheap and powerful form of human nutrition -- and an important part of culture. It's one thing to ask wealthy businessmen to stop having exotic breeds of fish shipped in from across the globe, refrigerated the whole time. It's another to eliminate fish from the diets of coastal peoples who make their living from the sea.