Anyone who has crossed from Shekou to Tun Mun via the Shenzhen Bay Western Corridor Bridge has seen the clear line that demarcates the Shenzhen-Hong Kong borridor. South of the border are floating oyster beds. North of the border, it has been illegal to raise oysters since 2006. However, at the remnants of what was once Shenzhen Harbor, those oysters are sold by the men and women who raise them — all of whom live in Shenzhen. Today’s impressions from a walk that stretches from the upscale neighborhoods of the Peninsula Estates and the Shenzhen Bay Park to the impromptu docks, where oysters were being unloaded and sold, along with a yellow fish.