The cushion is the slow water at the bottom of the stream. Here, midge larvae construct and seal themselves inside a immobile pupal chamber and transform to pupae. Wild trout congregate here to conserve energy. As the concentration of pupa increases, the trout notice them and begin to feed. When its hatch time pupae ascend to the surface film, bore a hole, and crawl through leaving the shuck to ride the surface film as adults and take off. They are helpless. The trout follow them to the surface and suspend to effortlessly pick them off.
More tomorrow.
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