Cui-ui (Chasmistes cujus)
Cui-ui were listed as endangered in 1967 and are believed to be the last genetically pure member of the lake sucker genus Chasmistes. They are a long-lived fish that are known to live up to 45 years of age and are only found in Pyramid Lake. They are obligate freshwater stream spawners.
Lahontan cutthroat trout (Oncorhynchus clarkii henshawi)
The Pilot Peak strain Lahontan cutthroat trout represents the original lake form that evolved in ancient Lake Lahontan and existed in the Truckee, Tahoe and Walker Lake Basins. Once thought to be extinct, transplanted Lahontan cutthroat trout were found in the Pilot Peak Mountains along the Nevada/Utah border in the late 1970s. Utilizing genetics of museum mounts from 1872 to 1911 of fish known to be from the Truckee River Basin, it was determined that the Lahontan cutthroat trout in the Pilot Mountains were descendants of the original Truckee Basin Lahontan cutthroat trout.
Through years of careful genetic management and refining conservationstrategies, the genetic legacy of the original lake form Lahontan cutthroat trout was secured at Lahontan National Fish Hatchery. The Lahontan National Fish Hatchery Complex began stocking Pilot Peak Lahontan cutthroat trout into Pyramid Lake in 2006, in collaboration with the Pyramid Lake Paiute Tribe. True to their genetic potential, the Pilot Peak strain in Pyramid Lake exhibits life history traits found in the original population such as large size, long life span, late at reaching sexual maturity and piscivory.