Dunedin's Neptune club won the overall club title, taking 18 gold, 18 silver and 15 bronze medals in a total haul of 51.
Its 828 points was a whopping 374 more than the next best, Christchurch's Wharenui club.
As well as plenty of medals, Otago swimmers also set six South Island records.
Neptune's Kate Godfrey (20), who had a stellar weekend with seven gold, one silver and a bronze, set records in the 100m backstroke (1min 02.04sec) and the 200m backstroke (2min 13.93sec).
Han Zhang (16) and Caitlin Deans (14), both from the Neptune club, were also in record-breaking form.
Zhang set a record in the 200m breaststroke (2min 23.09sec), and Deans set records in the 400m freestyle (4min 25.26sec) and 800m freestyle (9min 4.71sec).
Tame Govaerts (15), from Dunedin's Zenith club, set a record in the 200m breaststroke, finishing in 2min 22.58sec, on his way to gold.
Deans continues to flourish in the freestyle discipline. Just as she did last month in Wellington, she won the 200m, 400m and 800m freestyle events, and finished second in the 100m freestyle.
Jeremy Tasker (20) had a fine weekend, winning four gold, three silver and two bronze medals.
He won the 400m individual medley, 200m, 400m and 1500m freestyle events. However, Tasker had to share gold with Christchurch's Chris McFadden in the 400m freestyle after the two touched the wall at the same time for a rare tie.
Cecilia Crooks (13) continued to improve, picking up seven medals, including gold in the 200m backstroke and silver in the 100m backstroke and the 400m and 800m freestyle.
Otago's relay teams also tasted success. The female teams won a gold, four silver and a bronze, and the male teams won three silver and two bronze.
The gold-winning team in the open 400m freestyle was made up of Deans, Godfrey, Olivia Gold and Stephanie Gillespie.
Swim Dunedin coach Gennadiy Labara, who trains the swimmers from Neptune, Zenith and Taieri, said the weekend went well.
''I'm very, very pleased. The team worked very well and it all went to plan.''
-by Robert Van Royen
