Yes, but this is not really one of them. Yes, captive breeding is the only thing keeping the species afloat. Without captive breeding, they would be completely gone from this world. They breed very, very readily, which is one reason why they are popular among scientific studies. There is no need to harvest them from the wild because they reproduce with very little prompting. If you can get hundreds of axolotls and multiple generations from a single pair, why would you repeatedly take them from the wild?There can be more than one reason.