Spawning Behavior
The cui-ui is potamodromous, and will attempt to ascend the Truckee River to spawn in mid-April. If inflow is insufficient to permit this, the cui-ui may attempt to spawn in Pyramid Lake, but generally with little success due to the salinity of that lake. Water releases from the Boca and Stampede reservoirs are currently (as of 2004) timed to assist the spawning run, although in drought years this water is reserved for the Reno metropolitan area. These releases are critical to successful spawning since low warm flows at the Truckee River delta are inhospitable to upstream migration of adults. Several hatcheries are maintained by the Paiute nation to ensure that such a situation does not impact the long term viability of the cui-ui. These measures have greatly increased cui-ui populations, although it is still listed as an endangered species.
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