I'm exercising my google-fu, and this is what I got.
Well, apple snails can be very inactive for days and if they have a lot of air in their lung, they float (sounds logical isn't it?). Floating of an apple snail doesn't indicate that there is something wrong or that he/she is dead
To check if the snail is alive, take it out of the water and see if you can get it moving by touching the shell door. If the shell is closed completely, then you can be sure that the snail is alive because once the snail is dead, the muscles are relaxed and the shell door stays at least partly open.
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Last edited by xjenuhfur; 04-04-2012 at 10:32 AM.