That is a tough question to ask on a saltwater fish forum because most of the fish in our tanks come directly from the ocean. Unfortunetely, most types of fish do not breed in captivity yet so we do get our fish from the ocean. I love my fish, but I just hope that the fish traders are not over fishing and taking too many fish year round from the reef's because this could cause problems.
I think eventually they will figure out how to get more fish to breed in captivity. I know reefs have it hard enough. I was shocked when my wife and I went to Aruba and they just bulldoze the reefs every time a new hotel goes in. They have just stacks and stacks of live rock and old dry rock thrown everywhere.
I did steal a small piece and brought it back with me so it could do some good.