ok, you cna get tank raised tangs, which would have a much higher survival rate, than any caught fish, but they are harder to find
and the use of cyanide, many ocuntries do still use this method,and it is up to us to stop it, by not supporting the practice, they use this practice on many different fish, and it does shorten and lessen their lives, as for who does, it is my opinion that mostly the polynesian countries use this practic(if that helps any), soem other countries do allow it, but many do not practice it, many suppliers, if they either tank raise or buy only net caught, they are not as fast to avoid the topic and will often boast it too
HTH