Gamblers lost a record $4.07 billion in Nevada casinos in fiscal 1988 to give the clubs a 9.8 percent revenue gain over the previous year, a report says.

Gaming Control Board spokesman Harlan Elges called the results for the 12 months ended June 30 good, although he noted that 1987 revenue had been a bit higher, 10.2 percent, when compared with 1986."There are no downturns, nothing is slowing the casino industry down at this point," Elges said.

In the Las Vegas area, clubs grossed $2.83 billion, or about 70 percent of all winnings, up 10.2 percent from 1987, the board said. In the Reno area, the take was $729.3 million, up 7.2 percent from the prior year.

In Douglas County, including clubs on Lake Tahoe's south shore, resorts grossed $336.2 million, an 11.2 percent increase. And in Elko County, resorts took in $94.7 million, up 13.3 percent.

Carson City showed the only decrease, with the $36.5 million taken in by clubs here reflecting a 2.2 percent decline in the money won from gamblers the year before.