HI I didn't think I would be able to get a spawn in my 1/3+ acre pond but I sank 2 - 12ft long hollowed out logs (courtesy of carpenter ants!) along with several pieces of 1' by 2' by 8 ft long vent ducting that I removed during a remolding project. Most of my cats are 5 pounds plus stocked 3 years ago but this year I have caught several 8-10 inch cats so I guess I did get a spawn. Most of the structure was put in 4 ft deep water.

Bob