Older trees have been cleared and about 40 new seedlings have been shifted into the area.
And, Dr Agnew said, there were signs breeding success this season at the Oamaru Creek colony was "catching up slowly''.
This week 63 chicks and 164 eggs were counted at the commercial colony, while at the Oamaru Creek colony there were 129 eggs and 10 chicks.
"They've coped, they're settling into it and carrying on with their egg-laying,'' Dr Agnew said.
"And they're getting up the rocks just fine. We can see poop everywhere so they're obviously managing to find their way up, no worries.''
The birds at both colonies would continue to lay eggs until Christmas and the last chicks would not fledge until March.
hamish.maclean@odt.co.nz