i do suppose the next best bet would be a island somewhere in the ocean, by the time they reached you they would be bloated blobs, granted i would stop fishing all together at that point. But in would the zombies sink or float after awhile? you would think they would just go to the bottom of the ocean and walk till they fall into a crevas and are never seen again, or after a certain depth their heads would just pop, but then you got fish eating it all and ugh gross.