"They may shoot quite a high population of the birds out there."
He said the big unknown was what condition the ducks would be in with food and habitat under pressure during the big dry.
"What we don't know is how many of those have survived this drought."
The Eastern region had responded by limiting its season to four weeks for mallard and grey duck.
Upland game birds - pheasant and quail, and other game bird species such as paradise shelduck and black swan - have a longer season extending into July and August depending on the species and region.
Fish and Game rangers will be out across the Eastern Region this weekend checking hunters' success and making sure hunting regulations are being followed, hunters are carrying their licenses and they're complying with the ban on using lead shot ammunition in 12-gauge shotguns over open water.
Hunters are also encouraged to report any banded birds harvested, along with band number, location and date recovered, and their personal details, to help Fish and Game monitor birds and ensure sustainable hunting in future.