A few year ago I came apon a guy, who's business was shark fins. He bought them from commercial fishermen and dried them before exporting them. I had a look at his setup and there were heaps of drying fins there. He wasn't of asian origin - Italian from memory, but that is not relevant. He was being affected by the GBRMP closure, so was thinking of moving his operation to one of the pacific island where shark fins were more plentiful.
Steve