Zirk won four titles as Plymouth Leander enjoyed a highly-successful meet, returning home with 29 medals.
Madelyn Moore, Tegan Drew, Charlie Boden and Sam Dailley all claimed three or more medals in the North West.
Zirk’s successes came in the junior men’s 50m and 100m butterfly and the 50m and 100m freestyle events.
He was so dominant in the 100m butterfly final that he won by more than four seconds, clocking an impressive 52.37 seconds.
His team-mate Dailley was second in that race and he also took silver behind him in the 50m butterfly and claimed a bronze in the junior men’s 200m freestyle.
Moore claimed two golds, a silver and two bronzes in Manchester. She also set two Bermuda national records in the process.
Her title wins came in the junior girls’ 50m and 100m freestyle events in times of 26.42 seconds and 57.52, respectively. Her silver was achieved in the 50m backstroke and her bronzes came in the 50m butterfly and 100m backstroke.
The 100m backstroke was won by her Leander team-mate Drew in 1:01.52.
Drew also triumphed in the 50m backstroke and took silver in the 50m butterfly and bronze in the 100m butterfly.
Boden enjoyed a good meet. He won two golds in the junior men’s 100m and 200m backstroke events and took silver in the 200m butterfly. Team-mate Oscar Brain was second to him in the two backstroke races.
There was a gold for Maltese swimmer Matthew Zammit, who won the men’s 50m freestyle in 22.26 seconds, which is a new national record. Club team-mate Tom Fannon was third in that final.
Jessica Jackson won the women’s 100m freestyle in 54.83 seconds and also took bronze in the 50m freestyle.
There was a silver for David Miller in the junior men’s 200m breaststroke, with his team-mate Morgan Norman taking bronze in the same race.
There was also a bronze for Tom Rudd in the men’s 50m backstroke, while Leander also claimed a mixed freestyle silver medal.
Meanwhile, fellow Leander swimmer Ana-Maria Damjanovska won six gold medals at the Macedonian Championships.