Binder:
For those interested here is a shot of one in current use in North Pine. Shrimp are a bit quiet being winter and all, but still getting a few.
I've got some of these and some normal square traps in, these are getting 10 to 20 shrimp a day, the square ones 5 to 10 shrimp. Definitely reckon it is the black colour that helps.
elops:
Like these traps a lot myself, mainly use them to trap fish though. Much better than the sqare traps. A lot more fish friendly than the standard net ones which are useless as the fish get gilled in the mesh.