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Frederiksen claims fourth GB pool gold
Britain's Heather Frederiksen set a new world record in her 100m backstroke event to win gold in the Water Cube.
And David Roberts won his ninth Paralympic gold as the 4x100m freestyle relay team took seven seconds off the world record to defend their crown.
Frederiksen finished in one minute 16.74 seconds, three seconds ahead of second-placed Jessica Long of America.
"Winning silver (in the 100m freestyle) was great, but this is an unbelievable feeling," she told BBC Sport.
The relay team is made up of swimmers whose disability categories add up to 34 - in Britain's case, two S10 and two S7 swimmers.
Swansea swimmer Graham Edmunds took over from Matt Walker with the team in seventh place and moved into the lead at the halfway changeover.
Welshman Roberts and Robert Welbourn held off the Australian and Chinese teams to take gold.
I've never felt as much pain swimming breaststroke as I did in the last 25m
Edmunds said: "To come back and retain the title is so much better than just winning it in Athens."
And Pontypridd ace Roberts added: "The team may have changed, but we've proved we're still the best in the world."
Roberts went in to the Games hoping to surpass fellow Welsh athlete Dame Tanni Grey Thompson as the most successful British Paralympian of all time.
But the International Paralympic Association's discovery that swimmer Mike Kenny won 16 golds across four Games in the 1970s and 1980s has put pay to that.
Jon Fox won 100m backstroke (S7) silver, while Sean Fraser and Louise Watkin won bronzes in their backstroke and breaststroke events respectively.
Fox finished behind America's Lantz Lamback, who had broken his 100m backstroke world record in the heats and lowered it again in the final by two seconds more to win in 1:12.09 seconds.
The 17-year-old, who lowered his own British record to 1:14.34, said: "I didn't think Lantz was going to go that first in the final - I gave everything and I'm happy with silver, but he was too fast."
Fellow Brit Andrew Lindsay was fourth in the race.
He said: "I'm a little disappointed. My time was quite good, but I thought we'd reel Lantz in. The youngsters are coming through though and this man (Fox) deserves his silver."
Watkin was surprised to win bronze in the 100m breaststroke (SB9) in 1:26.10 seconds, behind New Zealand's gold medallist Sophie Pascoe.
The 16-year-old told BBC Sport: "I am extremely shocked, I wasn't expecting this.
"It is one of the strokes I train, but I'm mainly a freestyle swimmer.
"I've never felt as much pain swimming breaststroke as I did in the last 25m."
It was Watkin's second medal of the Games after she won silver in the women's S9 100m freestyle behind South African Olympian Natalie du Toit on Tuesday.
"I've exceeded my expectations already," added Watkin, who will race in three more events at the Water Cube.
Watkin's team-mate Kate Grey finshed fifth.
In the 100m freestyle (S13) Rhiannon Henry and Jenny Coughlin were seventh and eighth respectively in the final.
Fraser qualified third fastest for the final of the 100m backstroke (S8) and duly won bronze, five seconds behind Russia's Konstantin Lisenkov who set a new world record of 1:06.33.
"It's my first Paralympics and I've got a medal, so I'm happy," he said.
"I made tough goals for myself and this medal will be keep me motivated for London 2012."
Video - Swim relay team smash record