I have been trying for this for some time and finally got onto Brook Trout spawning. I have posted an image taken with the little Nikon AW1 with 10mm lens set at f5.6. I used ISO 400 to get the shutter speed up high enough where I felt comfortable holding the camera steady. This did not involve anything other than laying on the bank, holding on with one hand to keep from rolling into the cold stream while photographing one handed by reaching as far out into the stream as I could, then imaging.
Now I would like to find a nice stream where Brown Trout are spawning as both the Brook and the Brown spawn in the fall with the run being triggered by water temperature, daylight hours and water flow.