Bruce (15) showed his dominance by winning three titles at the South Island secondary schools championships on Lake Ruataniwha.
He won the boys under-16 single sculls in 7min 55.64sec and went even faster when winning the under-17 single sculls in 7min 49.61sec.
He later teamed with training partner Nathan Redai to win the under-16 double sculls in 7min 11.58sec.
Bruce is the son of Robert Bruce, who won a Maadi Cup single sculls title 30 years ago.
Dunstan High School was the top girls school at the regatta, winning two gold medals and a silver.
Lucy Geddes and Ella Galletly were convincing winners of the girls under-16 double sculls in 8min 8.42sec.
Geddes also won the under-16 girls single sculls in 8min 56.18sec. Riley Homan (Queen's High School) was second.
The Dunstan girls under-18 lightweight double scull of Sydney Cook and Macaela Turfu was second.
Emma Winders (Columba College), who won a silver and a bronze medal at last month's national championships on Lake Karapiro, was a convincing winner of the girls under-18 single sculls in 8min 19.70sec.
The under-16 eight, stroked by Sara Griffin, was third.
Columba College won the novice girls eight in 7min 51.56sec.
It was stroked by Ryelee Breen.
Junior international Jack O'Leary (Kavanagh College) easily won the boys under-18 single sculls in 7min 24.60sec.
The St Kevin's College girls under-18 double scull of Sydney Telfur and Tiana Mihaere won the title in 8min 5.45sec.
Telfur and Georgie Dyson won the under-18 novice double sculls in 8min 22.89sec.
The Waitaki Boys' High School under-15 four (stroke Mark Taylor) was second.
Taylor and James Scott were third in the under-15 double sculls.
Maysie Scott (Waitaki Girls' High School) was third in the under-18 single sculls and stroked the under-18 quadruple sculls that finished second.
St Hilda's Collegiate had three third placings: Courtney Shea and Claudia Paterson in the under-18 double sculls, Eliza Adams and Zoe Sabonabaire in the under-17 double sculls , and the under-15 four.
Otago Boys' High School was third in the under-17 eight (stroke Scott Bezett), and third in the novice four (stroke Nick Henderson).
John McGlashan College was third in the under-16 boys double sculls (Tom Grave, Woody Kirkwood), and third in the under-16 quadruple sculls (stroke Grave).
