Saturday's event was raced in calm, sunny conditions, with competitors completing a 500m swim in Lake Tewa, a 20km bike ride and a 5km off-road run.
A dozen people entered the duathlon, which comprised a 1.7km off-road run, a 20km bike and a 5km off-road run.
Neville Thorne, of Te Anau, won the open male category in 1hr 05min 35sec, with Andrew Crowley, of Dunedin, second with a time of 1.09:02 and former New Zealand cyclist Matt Randall, of Invercargill, third in 1.10:41.
The open female category was won convincingly by Tanya Dromgool, of Queenstown, who was back to defend her title from race one at Jacks Point, with a time of 1.11:00.
Julie Williams, of Alexandra, placed second (1.19:41) and Helen Seyb, of Queenstown was third (1.24:05).
Fynn Thompson (15) continued to impress and, after finishing sixth in his age group at the national schools event last week, he dominated the race and won the junior male category in 1.08:09, putting him in second place overall.
Jodie Llewellyn, of Arrowtown, won the junior female category in 1.37:40.
The duathlon battle was won by Rob Cook, of Queenstown, in 1.13:58, having been pushed hard by Invercargill's Craig Tait who finished second in 1.15:54.
Viv Buchanan, of Cromwell, won the female duathlon (1.21:15), with Susie Read taking second place in 1.27:21 and crossing the finish line with her 2-year-old son and 3-year-old daughter.
Race director Gemma Boyle said it was the fourth of the five events in the series. The final event will be the Lake Hayes Triathlon on April 22, New Zealand's longest surviving triathlon.
Ms Boyle was delighted with Saturday's event.
"This really is a stunning location for triathlon or duathlon, and the course just looked so inviting out there today," she said.
"It is great to see those dedicated individuals turning up to every race in the series, as well as seeing so many who are competing for the first time. It is very inspiring."
