Bethany Carson set two new personal bests, her second in the semi finals of the 100m butterfly.
After breaking her previous best in the heats she then swam 1:03.13 to finish 14th overall.
Laurence McGivern, who was the only junior in the S9 50m freestyle final, finished in seventh place in 28.95 in a highly competitive field where the winner set a world record. He also set a personal best in the morning session of 28.84.
The 4x200m freestyle relay girls — Melanie Nocher, Sycerika McMahon, Carson and Clare Dawson – broke the Ulster record by almost 40 seconds, recording a time of 8:13.02.
Dawson said: “It was good being here and competing in the relay as a team and that was a new Ulster Senior record so we are pretty happy with that, especially up against the top teams.
“It was good for us to get a relay in as we haven't competed on the same team before, so where better to do it than the Commonwealths!”
James Goddard collected a gold medal for England but Fran Halsall collapsed and Rebecca Adlington revealed she too was unwell less than 24 hours ahead of her 800metres freestyle final as the spectre of sickness overshadowed the action in Delhi.
Goddard added the 200m backstroke title to the one he won in Manchester eight years ago in a world-class time of one minute 55.58 seconds, a Games record.
The next race saw Halsall surprisingly beaten into third in the 100m freestyle final by Australia's Alicia Coutts and the 20-year-old was clearly struggling when she returned 20 minutes later for the 100m butterfly semi-final from which she failed to progress.
The reason soon became apparent – Halsall had to be hauled out of the pool to prevent her from fainting before she was led away to be sick by team doctor Ian Gordon.
The Liverpool-born swimmer then appeared before the media shivering, washed out and clearly weak.
She said: “I don't think I'm very well to be honest.
“I had tummy issues last night and they carried on through today.
“I just didn't have anything to give and I just don't feel very well.”
Double Olympic champion Adlington revealed she was also suffering less than 24 hours before she looks to claim the title in her favoured event, the 800m freestyle.