Welcome to Marble Bluff Fish Passage and Research Facility! The facility is operated primarily from February to July to aid in the spawning migration of endangered Cui-ui and threatened Lahontan cutthroat trout from Pyramid Lake to the Truckee River.

About Us

Marble Bluff Fish Passage and Research Facility is one of three facilities within the Lahontan National Fish Hatchery Complex. The facility is critical in assisting and monitoring fish spawning runs from Pyramid Lake into the Truckee River, including the recently re-established migration of threatened Lahontan cutthroat trout and the migration of Cui-ui sucker, which live nowhere else in the world. 

Marble Bluff Fish Passage and Research Facility is operated by the Lahontan Fish and Wildlife Conservation Office and maintained in partnership with the U.S. Bureau of Reclamation. The facility is located within the boundaries of the Pyramid Lake Paiute Tribe reservation and all activities are conducted in partnership with the Pyramid Lake Paiute Tribe.  

Our Organization

Juvenile Northern Pike in aquarium at Gavins Point National Fish Hatchery, South Dakota
The Fish and Aquatic Conservation program leads aquatic conservation efforts for the U.S. Fish and Wildlife Service. We are committed to tackling the nation’s highest priority aquatic conservation and recreational challenges to conserve, restore, and enhance fisheries for future generations.

Our Species

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 conservation broodstock broodstock
The reproductively mature adults in a population that breed (or spawn) and produce more individuals (offspring or progeny).

Learn more about broodstock
strategies, 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.  

Visit Us

Marble Bluff Fish Passage and Research Facility is open to the public Monday-Friday from 8:00 am to 3:00 pm during the spawning season (February to July, except federal holidays). If you are interested in seeing fish at the facility we recommend calling ahead as the months above are approximate and the spawning season does vary due to water conditions and temperature.  

Location and Contact Information