Lenton sets 50m freestyle Games record
Leisel Jones set the first world record of the Commonwealth Games, while Papua New Guinea won its first swimming title on Monday.
Libby Lenton collected two golds to take her tally to four and to push Australia's total on the penultimate day of the swimming competition to 13, all won by women.
Papuan Ryan Pini edged out Australia's Michael Klim in the men's 100 metres butterfly, touching in 52.64 seconds.
"It's unbelievable," Pini told Reuters. "I'm very, very surprised with the result. I was stunned to see the flag being raised." Klim took silver 0.06 seconds behind.
Jones set the first world record of the Games, shattering her previous mark by 0.62 seconds in the women's 100 metres breaststroke to clock one minute 05.09 seconds.
It was the world champion's third gold after the 50 and 200. Jones shook her head in disbelief after realising what she had done.
"I was in absolute shock," she said. "I couldn't believe it. It hasn't really sunk in."
Fellow Australian Jade Edmistone was a distant runner-up in 1:07.24.
World champion Lenton captured gold in the women's 50m freestyle, setting a Games record of 24.61 to lead an Australian sweep. Jodie Henry took silver and Alice Mills bronze.
"This is my pet event so I had high expectations," said Lenton. "It's been amazing."
Lenton won her fourth gold after leading off Australia's 4x100 metres freestyle team, who just missed the world record, winning in 3:36.49.
England's Christopher Cook completed a 50 and 100 breaststroke double by winning the one-length race in 28.01.
Cook's gold was England's seventh in swimming and Liam Tancock made it eight by storming to the men's 100 backstroke gold in a Games record of 54.53.
Scotland's Caitlin McClatchey added the women's 400 freestyle gold to her 200 title, clocking 4:07.69 with England's Joanne Jackson taking silver.
"It feels fantastic -- I can't believe it," McClatchey, shivering under a towel, told reporters. "I didn't even expect to win one gold medal so I'm overwhelmed."
Gregor Tait won his second gold -- and Scotland's sixth -- with victory in the men's 200 metres individual medley in 2:00.73.
Sophie Edington added the 50 backstroke title to the 100 she won on Saturday, out-touching fellow Australian Giaan Rooney to win in a Games record-equalling 28.42.
Australia's Joanna Fargus won gold in the women's 200 backstroke in a Games best time of 2:10.36.