Swimming New Zealand chief executive Mike Byrne stepped down from his role on Friday following the release of a highly-critical report into the organisation.
The review last week recommended that the entire board resign and the role of chief executive be overhauled.
It was initiated after a bitter falling out between the Swimming New Zealand board and many of its regional bodies over the way the sport was being run.
A statement from Swimming New Zealand says Byrne has resigned to allow the organisation to move forward productively.
It says all operational matters are now the responsibility of general manager Mark O'Connor.