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Lani Pallister has won her second world short course gold medal, adding the 800 metres freestyle title to her Melbourne haul.
The young Australian opened her championship account with the 400 metres crown on Tuesday night and 24 hours later added another gold.
Kaylee McKeown then added another gold medal for the Dolphins, pipping teammate Mollie O'Callaghan to win the 100m backstroke.
Teen Isaac Cooper, who was banished from the Commonwealth Games team for misusing prescription medication, won bronze in the men's 100m backstroke behind American Ryan Murphy.
The daughter of former Australian distance swimming great Janelle Elford, 20-year-old Pallister took control of the race from the get-go.
With four laps to go her lead was out to half a pool length before she touched the wall in 8 minutes 4.07 seconds, which was 6.34 seconds ahead of the field.
It also beat her personal best by more than three seconds.
Kiwi Erica Fairweather, who also won silver in the 400m, finished second with Japan's Miyu Namba in third.
The Queenslander's world championship success has come after she considered giving the sport away following heart surgery as well as battling an eating disorder and glandular fever over the past two years.
"It will probably take until the end of the week to sink in," Pallister told Nine before starting preparations for the 4x200m freestyle relay final.
"I swam a PB last night so I was excited to build on it again and to come away with another gold is just insane."
World record holder in the long course 100m backstroke, McKeown who swam in lane seven, touched the wall in 55.49 seconds with O'Callaghan taking silver with 55.62 and American Claire Curzan third.
The triple Olympic gold medallist needed a big finish to overhaul the field.
"I had a rough turn on the third 25 and I had to give it everything cause I had a bit of catching up to do," the 21-year-old said.
