They sunk to the bottom and te fronds float straight up, as in the picutre made at my pond today. When I threw it in, I was standing on one of the fronds, and it broke off. I'd suggest NOT picking this thing up by a frond. I maneuvered the AquaMat with my net. This is the final array of the Aqua Mats for several reasons.
Plants are crucial.
The end where all the matts converge is where I suspect the females will find themselves in a prime position to spawn. Its not hormones. Hormone shots probably harm the situation. The eggs are indeed there, they just don't get laid, and I don't think anyone knows why. Dr. Gratzek at University of Georgia maintains that in ponds large enough, the bottom of the pool and the ornamentation in it can support enough nitrifiers to reduce the load produced by the fish.