No airline allows fish in checked baggage. American and Continental were the last and I was denied a pre-approved shipment, on American, because the rules changed in the 3 days from my confirmed reservation to my flight. The clerk at American told me to try Continental. When I did, I was shot down by Continental, too. Had to reschedule my flight to give me time to take the fish to the Post Office main terminal (freight shippers were closed for the day). $923.00 for shipping the fish and a $100 passenger ticket reassignment later, I was ready for my flight and the asylum.