As I've posted in the past, I've tried about everything...... roman candles, shellcrackers, fake foxes, even my grandson's remote controlled boat but the only thing that keeps them out permanently is the strings of flags that you buy in the party store......the kind that business' use for openings and such.
Using small stakes, string them so that the tips of the flags are 6" to 8" off the ground right at the waters edge. Don't leave any low spots for them to get around from the sides.
After a couple of weeks they left and don't even come in our bay anymore.
This is the 3rd year this has worked for us.....finally got rid of those fuzzy little water rats.
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