Animal activists have dumped about 100 dead ducks from a wetland near Kerang, outside the Department of Sustainability's (DSE) offices in Melbourne today.

The protesters say the birds were shot by hunters, but were left in the water at McDonald's Swamp.

Laurie Levy from the Coalition Against Duck Shooting says duck rescue teams will be in the wetlands for the rest of the duck hunting season to try to prevent bird deaths.

He says the state's wildlife officers are not doing their job.

"With 15 wildlife officers to cover the whole of Victoria, where you have 20,000 wetlands, they can't do the job," he said.

"It's impossible. There is no money, there is no budget for them."

Mr Levy says shooters are legally required to collect all birds that have been shot and must also euthanase the wounded ones.

The DSE says it employs a range of methods to gather intelligence to undertake strategic and targeted enforcement in addition to responding to reports of alleged illegal behaviour.

A shooters' group has criticised anti-hunting protesters who dumped the ducks.

Rob Drew, from Field and Game Australia, says it was just a media stunt.

He has questioned whether hunters killed the animals.

"There are birds dying from botulism in some wetlands in Victoria, and I think if they were serious they would have given those birds to DSE so they could be analysed properly," he said.