Locals complained the performance of Last Post was drowned out by the tourist jet boats on the river below yesterday morning.
Business manager for Tumu Pākihi Shotover Jet Donald Boyer acknowledged the complaints.
"We apologise unreservedly for the disturbance our boats created during [yesterday’s] Anzac ceremony on the Edith Cavell Bridge.
"We are deeply disappointed at what has occurred and will ensure we halt operations for future Anzac ceremonies."
Edith Cavell Bridge was named after a British World War 1 nurse who was executed for helping wounded Allied soldiers escape occupied Belgium.
Queenstown Returned and Services Association has been approached for comment.