Go back to the first pic in his post. See the PVC porcupines on the porch. That's them.

Ahh
 

Thanks Quack. Is it a ball that you put PVC in or do you buy them pre made?

In the first pic he posted, look over his right shoulder on the camp porch. Those PVC things. Kinda looks like a "sputnik"!!! It's a ball like thing with a bunch of holes to insert PVC pipes into for fish structure.

Ronnie

its called a 'cedar's bill dance porcupine ball'. they used to be sold at cabela's and bass pro 3 for $30, but after a quick search the only place i see them is on amazon. still 3 balls for $30. no pvc piping included.
i've also heard of people hanging them under their floating docks and that suspending them works almost as well as sinking them.

Yeah, I have 3 or 4 under my boat dock to go along with a few Christmas trees. Only problem, I only have around 18" of water!