Can you run a wire or fishing line 6" and 12" up off the dock around the perimiter of it? They might not want to fight the line to get on the dock. You might have to make a short gate for the land side of the dock.

I wonder how this stuff would work? I'd definately put tape down first, then apply it to the tape.

tanglefoot

I've also seen stainless steel spike strips that used in marinas to keep seagulls from perching on things.


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