More than 80 athletes competed in the swim-run race around the shores of Lake Wanaka, the first time an event of its kind had been held in New Zealand.
In a swim-run race, athletes swim and run in pairs through a multi-stage 50km or 15km course while staying within 10m of each other.
Shoes and wetsuits are worn for the entire race.
Breca race director Ben de Rivaz said Lake Wanaka provided the perfect terrain to launch the race in New Zealand.
The sport started in Sweden and was rapidly growing through Europe, Mr de Rivaz said.
It offered a different experience from other multisport events while still pushing the limits of the athletes competing.
The first pair over the line in the 50km race were Mike Phillips and Nick Berry.
Wanaka multisport athlete and New Zealand Ironman champion Braden Currie and Australian Courtney Atkinson won the sprint race.
