wild caught

Greeting all, For some reason, I have been believing most of the marine fish sold in the LFS are captive bred. Now I realized that I might be wrong about it. So how do I know if my yellow tang, yellow clown goby and firefish are captive bred or wild caught? Thank you in advanced!

just wanted to forewarn everyone in my area, GBR is selling wild caught fish and corals, dont condone the destruction of our natural reefs and dont buy from them till they change this practice! and if you feel as angry as i do (more so because they lied to me and said theyd never do this) go in...