As Rachel said, I would ask for half the money back, since the female did survive. But if the seller refuses to do that, I'd file the Paypal claim, and honestly, I'd want to let everyone here know who the seller is so we can avoid making purchases from that person. I know I would not want to buy fish from this person, not knowing about this situation, AND the fact this person did not do what was right to make things right for you.
-Rich
Excellant point!! Buyer BEWARE!!