I recently got a SA Lungfish that was captive bred. Usually small Lungfish tend to be captive bred from what I have seen, but not always a guarantee. As for Bichirs most upper jaws are captive bred. Lower jaw species are mostly wild caught except for Endlicheri, but it can vary heavily. I have seen P. Delhezi as both wild caught and captive bred on various online websites for example. But my P. Delhezi is captive bred, so I would say ask wherever you wanna buy it from, and ideally specify a species you like. Also a general rule of thumb, larger fish tend to be wild caught and smaller ones captive bred, not definitive but I have seen this quite a lot.