Fifteen-year-old Dyer justified his hot favourite's tag with his victory in the men's section. This was his third appearance in the event but first crack at the 2.5km distance.
"I will be back again next year to try and win the race again and so will our team," Dyer said referring to the fact he was part of the winning team which also included his clubmates and schoolmates, 16-year-olds Cameron Madams and Jade Wills.
Madams was fourth overall in 28m16s and Wills was seventh in 29m16s.
This trio competed in the 300m dash as a warm-up event for the 2.5km one and Dyer won the 15-19 years age group and overall title in 3m40s.
Madams and Wills were second and third respectively with the same time, 3m41s. Dyer's father Ross also had a successful morning when he won the 50-59 years 1km race in 19m08s.
"It was a great day all round. We had a celebration barbecue with Cameron and Jade and their families," Dyer said.
Like Adsett he will be attending the Central Long Course champs and the national age group champs. Other male age group winners in the 2.5km race were Bevan Jacobs in the under-15s, Steve Charles in the 30-39s, Adrian Rasmussen in the 40-49s, Dave Kruger in the 50-59sm and Peter Maguire in the 60plus.
Other female age group winners in the 2.5km distance were Sarah-Kate Birkett in the under-15s, Hannah Jones in the 20-29s, Lisa Birkett in the 30-39s, Tania Wotherspoon in the 40-49s, Carol Prop in the 50-59s and Ann Rogerson in the 60plus.
Aquahawks coach Frank Wylie won the 60plus 1km race in 21m53s.