Yes, the breeding program was immediately shut down when one of the females who was captured died. They just figured that is was not worth the risk anymore.
I have no idea of the sex ratio, unfortunately. I don't think they can even tell that from using echolocation to count them.
@valth so by that presumption if there were no males within the pod, it could already be too late.
Yep, absolutely. I believe that by being only 12 left, they are already functionally extinct.