Larne pair Conor Ferguson and Danielle Hill continued their recent record-breaking form on the final day of the Swim Ulster Invitational/Dave McCullagh Memorial meeting in Bangor.
Ferguson broke Karl Burdis' Irish 200m backstroke record from 2009 as he took victory in 2:01.56.
The 16-year-old was just 0.3 seconds outside the Olympic 100m backstroke qualifying time on Saturday and will attempt to make the team for Rio at the Irish Nationals at the end of April.
Hill achieved two more Irish junior records on Sunday as she triumphed in the 50m freestyle and 200m backstroke.
Over the three days Ferguson broke nine different Irish records and Hill six and both swimmers have also qualified for the European Senior Championships in the London 2012 pool in May.