The Disaster Preparedness Plan prepared by the local DHS for Union County NC explains what steps you should take if you have to evacuate and take your pet fish: "Your name and where you will be located should be on an ID tag and taped to the fish bowl. This should include your description of all your fish and pictures of them with you in the pictures for identification purposes."
(Thanks, Kkennedy!)
(Image: Fishbowl cat quilt27, a Creative Commons Attribution (2.0) image from lenore-m's photostream)