LOS BANOS, Laguna – Filipino swimmers set six new national junior records and improved on their previous performance as the 42nd Southeast Asia Age Group Swimming Championships wound up at the Trace Aquatics Center here on Sunday.

Filipino-American Jonathan Cook emerged as the most impressive after clinching the silver medal with a time of one minute and 3.58 seconds in the boys’ 13-under 100-meter breaststroke event.

His mark eclipsed the 1:05.47 clocking of Gerard Bordado in 2006.

Another impressive performer was from Arbeen Miguel Thrulen, whose bronze-medal time of 27.75 seconds in the boys’ 13-under butterfly stroke event erased the 11-year-old mark of 28.17 seconds of Gabriel Castelo in the three-day age group swimfest organized by the Philippine Swimming Inc, which is both recognized by the International Swimming Federation and Asia Swimming Federation.

A third significant mark was set by Liza Margarette Amoguis, who captured a bronze medal in the girls’ 13-under 400-meter individual medley in 5:19.62, lopping nearly seven minutes off the previous mark of 5:26.26 booked by Raven Faith Alcoseba three years ago.