The Duck Army led by 15-year-old ''commander'' Clementine Round and ''general'' Jack Styles, 13, held a small but loud rally of 100 mostly young protesters - and 300 less vocal rubber ducks - on the steps of Parliament.

Clutching photos of dead ducks, they chanted that wild horses couldn't make them vote for Mr Brumby. That is, if they were old enough to vote.

The young activists said they were undeterred by threats of violence from duck shooters left on a Facebook group they created calling for an end to duck shooting as a sport in Victoria.

''We've had them swamping our page and saying they are going to turn up today,'' said Clementine at her debut protest, which was inspired by witnessing last year's duck season in the marshes of Sale.

She said Mr Brumby was sending out mixed messages on violence by allowing children as young as 12 to shoot during duck season under adult supervision.

''We've been told we are kids and shouldn't be protesting but Brumby tells us that youth are violent and then he gives 12-year-olds guns to shoot or maim wildlife and it's hypocritical,'' she said.

''Eastern Victoria has so very few water birds left due to drought, climate change and loss of habitat.''

Her eloquent 13-year-old ''general'' Jack had his own take on why the state government still allowed duck shooting in Victoria despite bans in NSW and Queensland.

''Personally, I think it's so John Brumby can secure some rural votes, but we thought we had to do something to stop the violent slaughter when 82 per cent of eastern Australia's water birds have disappeared since 1983,'' he said.

This year's extended hunting season runs from March 20 to May 30 and shooters have an increased bag limit of eight birds, up from three last year.

The state government has said it extended this year's season based on an increase in bird numbers.