There are many animals and fish that have not been bred in captivity. Technology has little to do with it, it requires years of study to identify the means and triggers or reproduction. Even if you manage to mimic the natural environment perfectly there is no guarantee of success. I have never seen anything that says any sea world or aquarium has bred them. What makes you think these places are breeding them and not just capturing and rearing wild caught specimens?
Well I don't know what to tell you. I find it very hard to believe that we as humans have not been able to mimic nature, because from my study's and readings we are pretty **** smart... So you might want to read about that