I’m not sure why everyone is painting such a rosy picture here. Most of the fish we keep are wild caught. There is a high morbidity and mortality rate from when they as caught to the time they get to us. Additionally, a large number of fish who make it to our homes die from disease or lack of experience on our part. It is true that there are other forces that impact nature (excessive commercial fishing, bleaching of reefs secondary to global warming , etc) but that does not mean that what we are doing is acceptable or has no impact on nature.
If you want to go all captive bred, and I commend you for doing so, your selection of fish will be quite limited. You can also try buying fish that are no longer wanted from previous owners. I encourage you to do your own research and make your own decision as to how our hobby impacts Mother Earth. It certainly is not as rosy as everyone on this thread is making it out to be.
I do hope that the day arrives when all the creatures we keep are captive bred. It has certainly improved, largely due to Hawaiis ban on ornamental fish capture and import. However a lot of the fish come from Indonesia. As long as there is a steady supply of wild caught fish there is not much motivation to further develop captive bred.