Fish biologists say as many as 100,000 trout, bass and catfish have died the past month in the Sparks Marina along Interstate 80.
Nevada Department of Wildlife spokesman Chris Healy says low oxygen levels killed about 3,000 fish in one corner of the 77-acre lake in mid-December but they thought the event was localized and of limited impact.
Since then, they've been unable to detect any live fish.
Biologists say a cold-snap could have stirred up oxygen-poor waters but they don't understand yet what caused the massive die-off.
The dry January has expanded the severity of drought in California and Nevada.
Transcript of Nevada Gov. Brian Sandoval's State of the State address, delivered Thursday, Jan. 15, 2015, in the Nevada Assembly Chambers.
Marilyn Kirkpatrick, Democratic leader of the Nevada Assembly, delivered the party's official response to Gov. Brian Sandoval's 2015 State of the State Address.
Nevada Gov. Brian Sandoval took the oath of office for the second time Monday on the steps of the capitol. (Includes full transcript of inaugural address.)
(AP) - Nevada's demographer projects the state will have nearly 35,000 more residents in the year 2032 than it would have if it hadn't landed the Tesla Motors battery factory and another major business.