Yes, Tridacna clams are CITES listed - as CITES II which means the trade is
regulated (you cannot go out and collect them but a commercial operator with
the proper license can collect, grow, and sell them) and they have been
commercially grown for well over a decade and are harvested for the tourist
trade (locally), meat, and the aquarium trade. They have grown them long
enough that decent sized shells have been offered.
Tom Eichhorst
[log in to unmask]