These are probably more expensive than some, but they're high quality IMO.
http://www.catchnbait.com/pinfish-bait-fish-traps.htm
I put a small non-descript float on them and make sure the float stays under the surface so it takes a GPS to find them unless someone gets within 20 ft of them at idle speed. I got 2 and place them far enough apart so that if someone finds one and steals it, they are not likely to find both.



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