Okay, South Africa is extremely strictly controlled with wild collection of rock and coral for commercial purposes outlawed. Collection of hard coral for personal use is also not allowed, and the regs around softies is a bit grey. Fish may be collected for personal use but is subject to permits and bag limits.
Aquaculture is growing on a private scale, although it's very difficult (read impossible) to set up a licenced/ legal commercial prop operation as the government introduced to "Biodiversity Act" which is in place to prevent the possible invasion of alien species.
Moving north to Mozambique. A stunningly simple country with amazing reefs and marine resources, particularly the further north you go. Someone did try a lagoon based prop operation at Inhambane some years back, but found the "taxes" too exorbitant to make this viable. To my knowledge there are no commercial collectors there at present.
Kenya is the most prominent player, with a number of legal commercial collectors of fish, coral and rock.
I'd guess that 80% of the rock distributed in SA is claimed to come from Kenya, although there are constant allegations of local collection which gets the SA reefkeeping majority all steamed up.
Hope this goes some way to answering your questions, but pose specifics if you want.
