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.
Nevada's state forester has resigned less than two months after an independent review criticized the way the Nevada Division of Forestry responded to a prescribed burn that sparked an October wildfire, destroying 23 homes south of Reno.
Nevada lawmakers are advancing legislation to return voting rights to certain felons after they serve time.
Nevada Democrats are moving forward a proposal to give library managers clear authority to enforce weapons bans at their facilities.
The Nevada Department of Corrections has announced it is launching a program to combat opiate addiction in two state prisons.
U.S. Rep. Mark Amodei says, if he had to vote Monday, he would likely vote against a Republican plan to reform federal health care laws.