The reduction in flow to Pyramid Lake and the inability of Lahontan cutthroat trout (the salmon-trout as described by Frémont) to bypass the dam for spawning eliminated them from Lake Lahontan and its tributaries and caused the near extinction of the species. But in 1979 a remnant population of the original Pyramid Lake cutthroat trout was discovered in a small brook on Pilot Peak, on the Nevada/Utah border. This population was used to successfully restock Lake Lahontan.