There had been fog early which cleared as the morning went on.
Hunters' bags had varied around the region but "people seem to be happy," said Auckland / Waikato Fish & Game manager Ben Wilson.
Hunters near Himitangi in coastal Manawatu told Fish & Game staff they were "getting birds but working hard for them."
"The birds are around in good numbers but flying high - the ducks are up in the stratosphere," one hunter joked.
The best hunting reported so far has been from the Ida Valley near Alexandra in central Otago where hunters had achieved "very good success," with one group harvesting 40 mallard ducks in fine calm conditions.
Another group of five hunters had shot 40 paradise shelduck by 8.30am.
Lots of ducks and big flocks of Canada geese had been seen by Fish & Game officers who say the birds harvested had been "fat and healthy."
Compliance with the rules had been excellent which was very pleasing, Fish & Game said in a statement.
In the central South Island, near Oamaru, Fish & Game officer Rhys Adams said they had spoken to four groups before about 10am and almost all were "pretty happy."
Some hunters had bagged three or four birds each by 9am.
Some of the comments had been 'better than last year' and 'missed a few but it was my own fault,' he said.
He said that it was pleasing to see 100 per cent compliance with Fish & Game's rules and regulations.
Going by the number of gunshots, easy to hear in the fine clear conditions, there was a spread of hunters and every indication of a "pretty good opening."
Rhys Adams said the area was a "pond mecca" and bird numbers appeared to be strong -
one hunter had spoken of a pond with 200 birds on it, while he and a fellow officer had seen a gully creek containing a similar number of birds.
In the Marlborough region, the Para Wetland, a major restoration project now part completed, was described as a "standout" with hunters either achieving bag limits (eight mallards) or close to it.
Nelson Marlborough manager Rhys Barrier said it was encouraging as "Fish & Game has put a lot of work into saving the area as a wetland."
On the West Coast Fish & Game officers reported hunters getting mixed bags in mild cloudy conditions. One offence notice had been issued to a hunter with no game bird licence.
"There's ducks flying and plenty of opportunity," said Fish & Game officer Lee Cresswell.
Fish & Game Communications Manager Don Rood said that it was "great news" that so far there had been no reports of any firearm or other incidents.
"It's very pleasing and we are very hopeful of an incident free weekend - especially after a concerted safety push by not only Fish & Game but the Mountain Safety Council."
Fish & Game carefully monitors duck populations before deciding how many can be harvested. This year, annual aerial surveys confirmed good duck populations in all South Island regions, and there are similar reports from the North Island.
Hunters are reminded to check the rules and regulations if they haven't already done so. A number of regions have now introduced restrictions on the number of cartridges a shotgun magazine can hold. All hunters should visit www.fishandgame.org.nz and check the rules for the region they'll be hunting in.
The game bird hunting season closes on Sunday 27 August.