My husband introduced me to the word roiling recently. The definition for roiling is basically water or fluid made turbulent by “something”. My husband frantically brought my attention to what appeared to the naked eye, as fog on the water of the lake. He said that he hasn’t seen this for many years. It was a huge hatching of bugs. Darning needles maybe, not Dragonflies, but not sure exactly what. The hatching itself causes intense motion on the surface of the water. The fish below add to it. This was at dusk and at a great distance away. Wish I had been up close to see it, as it was really amazing!