When I was a child in an Italian Riviera coastline, close to the French border, I and others used to harvest vast amounts of raw limpets, raw mussels and even raw sea-urchins every summer -local fishermen would dive and collect the myriad octopi present in the submarine rocks. It was a marvellous experience, BUT, as time went one, the limpets turned completely orange and became very rare, all inevitably due to overpollution.....