PERTH, AUSTRALIA, JAN. 13 -- Germany's Joerg Hoffmann shattered one of swimming's longest-standing world records tonight, cutting more than four seconds off Soviet Vladimir Salnikov's 1983 mark in the men's 1,500-meter freestyle as the World Swimming Championships ended.

The United States added gold medals by Summer Sanders in the women's 200-meter butterfly and by the men's 400-meter medley relay to finish with 13 golds and 23 medals. It was the first time since 1978 the United States topped both the men's and women's standings.

Hoffmann, who won the 400 freestyle Friday, took the lead at 500 meters and held off a challenge by early leader Kieren Perkins of Australia to win his second gold in 14 minutes 50.36 seconds. Salnikov presented a bottle of champagne to Hoffmann at the postrace news conference.

Perkins also was well under Salnikov's 14:54.72, with a 14:50.58. He and Hoffman never were more than 1.01 seconds apart at any of the 100-meter splits. "I knew I could swim this time because that is what I've trained for," Hoffmann said. "All I needed was someone like Perkins to push me along."

Before this race, only Salnikov and Australia's Glen Housman had been officially under 14:56. Housman, who swam 14:55.25 last year, had a 14.53.59 at the 1990 Commonwealth Games, but because it was hand-timed it was not recognized for world records. Housman wasn't a factor tonight, taking fifth in 15:12.42 in the fastest-ever eight-man finish in the 1,500 freestyle.

Hungary's Tamas Darnyi broke two minutes in the men's 200-meter individual medley for his second world mark here. Darnyi, defending world and Olympic champion, won in 1:59.36 to shatter the 2:00.11 mark American David Wharton set in 1989. "I knew I was going to break the world record before the race," Darnyi said. "I didn't know I had it won for sure until the finish."

American Eric Namesnik was second in 2:01.87, then Germany's Christian Gessner in 2:02.36. Namesnik also chased Darnyi home in a world-record 4:12.36 in the 400 IM Tuesday.

Wharton failed to qualify for the final, having the ninth-fastest time in heats and having to settle for a first-place 2:03.10 in the consolation race. "I did not swim well this meet," Wharton said. "If I knew what was wrong, I'd have done something to try to fix it."

Sanders earned her first gold medal after a silver and a bronze. She won the 200 butterfly in 2:09.24, almost two seconds better than runner-up Rie Shito of Japan. Hayley Lewis of Australia, the 200 freestyle winner, was third. "This is a great way to end," Sanders said.

Zhuang Yong of China won the women's 50 in 25.47 seconds. Catherine Plewinski of France and Leigh Ann Fetter finished in a dead heat for second at 25.50, equalling Fetter's U.S. record.

Krisztina Egerszegi of Hungary won the women's 200 backstroke in a meet-record 2:09.15. It was the fifth gold medal for Hungarian swimmers and Egerszegi's second. She also won the 100 backstroke. Second was Germany's Dagmar Hase in 2:12.01, with American Janie Wagstaff third in 2:13.14.

The United States won the final event, the men's 400 medley relay, in a meet-record 3:39.66. The Soviet Union was second at 3:40.41, while Germany was third at 3:42.18. The U.S. team of Jeff Rouse (Fredericksburg, Va.), Eric Wunderlich, Mark Henderson (Fort Washington, Md.) and Matt Biondi broke the mark of 3:40.84 set by Americans Rick Carey, Steve Lundguist, Matt Gribble and Rowdy Gaines in 1982.

Chinese teenagers were 1-2 in the men's 10-meter platform diving. Sun Shuwei, 14, topped Xiong Ni, 17, with Soviet Gueorgi Tchogovadze third.