Is a CD made out of acrylic? I"m thinking cheapest option is a stack of blank CDs or DVDs? I see you can get colored ones (blue, or they make ones that look like LP records with black outside and colored interior ring). In my pond we get enough silt that what ever color the disk is it wouldn't stay that color very long. I'll search for other spawning structures too. Probably any plastic would work.
Males in spawning color are so beautiful!
I have waded out to my spawning structures which I mounted on a threaded rod with hex nut in between each CD and then pushed the long end of the threaded rod into the pond bottom. I could then rock the platter stack back and forth in the water to try to clean the silt off the disks and presumably the eggs. I don't know if silt prevent eggs from hatching and the silt comes from rain events with runoff into the pond. This is where if I could figure out how to keep a little water moving over the spawning structures it would probably help the eggs survive.
