Numbers have grown fourfold since the event began four years ago.
Sports director Des Smith said competitors came from more than 20 schools all over Otago and there were a few from Southland schools.
''The growing popularity of the event just underlines the evolution of multisport. Kids know this is a great event and they just love competing in it.''
About 50 young athletes competed as individuals and the remainder were in teams.
Two separate events were staged at the same time.
The swim triathlon comprised a 300m swim in Lake Dunstan's McNulty inlet, followed by a 20km cycle and a 6km run.
The multisport event was made up of a 3km kayak leg, followed by the cycling and running legs.
The winning individuals in the swimming triathlon were: junior, Hamish McKay (Dunstan High School) 1hr 21min 35sec; Georgia Vessey (Dunstan) 1:10:28; senior, Fyn Thompson (Wakatipu High School) 1:04:29; Amy Holland (Southland Girls' High School) 1:10:27.
Multisport individual winners were: junior, Sam McCulloch (Dunstan) 1:16:28; senior, Declan Pearson (Dunstan) 1:15:53; Robin Pieper (Dunstan) 1:15:16.
