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Two emergence trap designs were tested in Mono Lake, California, to measure in situ hatching of Artemia monica cysts on the lake bottom. One design incorporated a removable sample bottle; the other had a catch tube which was pumped from the surface. This gap was open during April and May but, because some animals entered from outside the area enclosed by the trap, the gap was covered with 400 mu m or 800 mu m screen during June and July.