My wife says to hook them thru the mouth from the bottom up and they will live longer. (you wanna tell her she's wrong?) Anyway, I've found that to be true. I'm guessing that it forces their mouths closed and they don't drown. To keep them alive on hot days, I put a 32oz bottle of frozen water in with them a couple times during the day. It works like a champ! I always have some because thats the way I carry my drinking water. Just take a few extra on hot days.
Fair Winds and Following Seas
Bill H. PTC USN Ret
Chesapeake, Va