Mark, look at fiberglass garden hoops for your dock.
Al I am not familiar with fiberglass garden hoops....
Is this what you are talking about?
I wonder if the birds might try to land on the hoop as a perch?
Or would the hoop be wobbly and they would not like that?
https://www.amazon.com/RowTunnel-Greenho...eway&sr=8-3