Doll flies (lumo) may represent damsel and dragonfly larvae. Fly fishing these imitations in New Zealand lakes and still waters will get results. They range from olive to tan and almost black, are free swimming. Damselfly and dragonfly nymphs are strong swimmers and undulate very much like a fish. When hunting for food, nymphs usually swim in short erratic bursts at a slight upward angle and then slowly settle while they rest. This swimming motion is fairly violent, but only carries the nymph a few inches.