"I am disappointed but not surprised New Zealand has been slow on the uptake for the new safety regulations," he said.
"What kind of message is it sending out to the rest of the world? If New Zealand becomes known as a dangerous country to holiday in, it will be difficult to recover from that."
High risk operators - including canyoning, mountaineering, bridge swinging and snow activity firms - were advised they had three months to register for a safety audit and a further six months to pass it.
Out of the first batch of 30 operators instructed to commence the registration process, a third had not taken steps to engage a safety audit provider.
Garth Dawson, chief executive of Outdoors New Zealand said operators were "getting to grips with the new requirements".
Lesley Haines, deputy chief executive of the ministry's health and safety group said the number registered was disappointing insisted the government initiative will meet its targets.
"We are now concentrating our focus on getting the safety audits underway and completed by next year," she told the Herald on Sunday.
"We have a really robust regime in place to ensure this happens."