Including relays, athletes from 17 Otago schools combined to win 82 gold, 63 silver and 57 bronze medals, a total of 202.
Unlike the Otago secondary schools championships in Dunedin earlier this month when 24 records were broken, just two fell in Invercargill.
Hurdler Christina Ashton (Queen's High School) added one record to the three she broke in Dunedin.
Fresh from winning silver in the 100m hurdles at the Australian junior championships less than a fortnight ago, she broke a 15-year-old record in the same event on Saturday.
Running into a 1.3m-per-second headwind, Ashton crossed the line first in 14.71sec to break the record by 0.63sec.
She won further gold medals in the 100m and 200m, before settling for silver in the senior girls triple jump.
Ashton pipped Emma Hopcroft (Southland Girls' High School) by 0.13sec to win the 100m final in 12.75sec, before getting the better of Caitlyn George (St Hilda's) by 0.54sec in the 200m.
Hamish Mears (Taieri College) entered the record books in the boys under-14 discus, breaking Sam Timmins' 2011 record by 29cm.
Mears surpassed Timmins' mark with his third throw of 44.64m.
Mears also won gold in the shot put and 80m hurdles, before snatching bronze in the high jump.
Ashton's younger sister, Hannah, made it six gold medals for the family when she won the girls under-14 80m hurdles, triple jump and high jump.
The Taieri College pupil was also a member of her school's 4 x 100m relay team, which finished second behind Southland Girls' High School.
While Danica Davies had to settle for silver behind Ashton in the 100m hurdles, the St Hilda's pupil snared gold medals in the senior girls javelin, shot put and high jump. Her 12.55m effort in the shot put was just 1cm short of the 1984 record.
Davies, the national junior heptathlon champion, was also a part of her school's 4x800m relay team with George, Hayley Shallard and Aria Park, which won a thrilling race over Columba College and Dunstan High School.
Felix McDonald also won a treble of gold medals to continue his fine season.
The King's High School pupil won his specialty events - 110m and 300m hurdles - before leaping 6.27m on his way to gold in the senior boys long jump.
McDonald was also a part of a King's 4x400m relay team with Jacob Granger, Sam Gouverneur and Rory O'Neill which comprehensively won in 3min 34.19sec.
Joccoaa Palmer (St Hilda's) won three gold medals in the girls under-16 age-group.
Palmer comfortably won the triple jump with a 10.38m effort, before recording close wins in the 100m and 400m races.
Including the boys under-15 4x100m relay, Josiah Lesa (King's) was on top of the podium four times on Saturday.
Lesa ran a sharp 11.94sec to win the 100m, beating Southland Boys' runner Josh Mason by 0.23sec.
He also won the 200m and 80m hurdles.
Fellow King's pupil Joshua Rosie had a good battle with Cromwell College's Ryan Francis in the AWD long jump, 100m and 200m.
Rosie won gold in all three events but had to work hard for the treble, particularly in the long jump, where he edged Francis by 4cm with a 3.79m jump.
Sammy Burke (Mt Aspiring College) continued where she left off at the Otago secondary schools championships in the 1500m and 3000m.
Having won both under-16 titles at the Caledonian Ground earlier this month, she added Otago-Southland titles to her name in convincing fashion.
Burke cantered to victory in the 3000m in 10min 58.69sec, before winning the 1500m in 5min 15.27sec, more than 12sec ahead of second-placed Lucy Pierce, of James Hargest College.
The South Island secondary schools championships will be held in Nelson this weekend.
