During the morning there was a good mixed hatch of caddis, some blue-winged olives and other small, pale upwings and a number of fish feeding. I saw - I think for the first time - a caddis on the river with its wings folded over its back. It was very similar to the one in my photo of a caddis on a nettle leaf. All the others were in flight, their wings a blur. As it is, at least in my experience, so rare to see a non-flying caddis on the water, I have never understood why so many artificial caddis patterns have folded wings.
Can someone please explain why this should be so?