This visit happened to coincide with the First Harvest Seaweed Festival which serves the first batch of harvested seaweed for the year from Wheat Island in Fujian. They apparently grow in nutrient rich and pollution free water. The first harvest refers to the limited window ideal for the seaweed harvest where the quality is supposed to be the best.
And how do I know these things? How the hell does anyone know anything these days? It starts with a 'G' and ends with an 'oogle', that's how.