wow this is horrible news. i hope you dont have to cut the preg rays but if it comes to it i hope the best for you. sorry for your losses so far and hope you dont lose anymore. good luck wish i could help.
I know its sad to think about this, but leave the pups in and watch the tank diligaintly. Right after the motoros die take them to a table or somthing lay them on there backs and you can push the pups out. I saw it on a video. It was a saltwater ray but hey its worth a try.
just lost my prized female motoro, she had 7 pups inside her, all of them were dead by the time i tried to do a c section and she wasnt dosed with panacure