The Devils Hole Pupfish: The Devils Hole provides pupfish with conditions of continuous temperature(92F-33C) and salinity, unlike the changing environments of many other pupfish. They've been seen as deep as 66 feet, they find food and spawn exclusively on a shallow rock shelf near the surface, they eat the algae and diatoms found there. They are considered an annual species, with their historic population changing between 100-200 in the winter and 300-500 in the late summer. Their population count mainly depend on how much algae is on the shelf. Because of water pumping, the water level went down exposing part of the natural shelf. People built an artificial shelf, but the fish didn’t use it. So they decided to limit pumping water out so
