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I can guarantee you if I had a float tube back home in MS, I would have carried a .22 revolver loaded with shot shells. I really prefer something in a .410 or larger.

http://www.youtube.com/embed/AJ2l4owxC7s

This is the reason boats lying on the banks of ponds are turned over carefully down south, there is a good chance a cottonmouth will be lying under it.