On the other hand, whenever I have ordered fish or anything that is delivered by mail "live", I add a couple of drops of Prime (or whatever ammonia binder) to a bucket or pitcher, and then dump the contents of the shipped bag into the container.  Or in the case of very large bags, like when I got my Majestic Angel from Divers Den, I just added some drops of Prime directly to the bag the instant it was opened.  It at least binds the ammonia to prevent sudden poisoning.  fwiw