He broke this record again in the final, dipping under 24 seconds to set a time of 23.95.
The final session got off to a flying start with both Brendan Gibbons (Athlone) and Conor Turner (Aer Lingus) going under the existing Irish junior record in the 1500m freestyle. Gibbons picked up the title in 8.12.35 with Turner just behind in 8.12.73.
Sycerika McMahon finished off her weekend with another Irish junior and senior record in the 200m breaststroke (2.27.18).
She also picked up gold in the 400m Individual Medley (4.44.89), while Shauna O’Brien from Waterford Crystal picked up two titles in the women’s 50m butterfly (27.85) and the 200m freestyle (2.02.26).
The men’s 400m IM was a thriller between Philip Duffy (St Pauls), Cian Duffy (Galway) and Andrew Meegan (Aer Lingus), with Meegan coming out on top in 4.29.59.
Kilkenny boys Colm Dowling and David Prendergast touched together for joint first in the men’s 100m backstroke in a time of 57.19.
The Lisburn City women’s team of Chloe Richards, Bethany Carson, Rachel Smyth and Natasha Pollock picked up gold in the 4x100 medley relay and 4x100 freestyle.
The Aer Lingus men’s team of Sean O’Brien, Barry Murphy, Andrew Meegan and Conor Turner took gold in the 4x100 medley relay, and with Gavin Truman replacing O’Brien, they also struck gold in the 4x100 freestyle relay.