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Fourteen-year-old Lil Clearwater (Neptune) had an excellent meet, claiming three golds, a silver and a bronze and breaking three Otago age-group records in the process.
Clearwater won the girls 14 to 15-year-old 50m, 100m and 200m backstroke in Otago record times of 31.84sec, 1min 5.79sec and 2:20.86 respectively.
Her swim in the 100m backstroke not only lowered the mark set by Stacey Clarke in September 1993, but she beat rival Otago swimmer Phoebe Williams (Waves) for gold.
Williams (15) provided one of the highlights with a superb swim in the girls 14 to 15-year-old 800m freestyle, lowering her own Otago record by more than 4sec to 8min 48.16sec.
The second-placed swimmer was more than 20sec slower.
She also won the 100m and 400m freestyle but was pipped by Clearwater in the 100 and 200m backstroke.
Emily Poon (13) picked up eight individual medals in girls under-13 events - one gold, six silvers and a bronze.
Like Clearwater, the Neptune swimmer broke three age-group records, lowering the 50m butterfly, 200m freestyle and the 50m backstroke times.
Poon was placed in every one of her events.
Frances Newbold (15), of Neptune, broke the 50m butterfly record which had stood for 11 years, and Matthew Glassford set an Otago mark for the men's open 100m breaststroke.
In all, Neptune had 18 swimmers at the event and claimed a total of 41 individual medals.
Perhaps the best performance came from the Otago open men's 4x100m medley relay team.
Nick Tyrrell, Shane Patience, Rhys Applegarth and Glassford beat the Canterbury team in a time of 3min 52.16sec.
Otago swimmers dominated the long-distance events, claiming the first three spots in the men's open 1500m freestyle and the under-13 1500m freestyle.
Dunedin-based swimming coach Andy Adair said Otago had a fantastic meet.
"A few years ago we weren't much of a force at the South Island champs at all, but we had nearly 70 swimmers there and you can see the results," he said.
He said Otago swimmers were well placed for the national short course championships beginning in Mt Maunganui later this month.