One hundred dead water birds have been dumped in front of the Victorian premier's office after the opening weekend of the duck season.

The Coalition Against Duck Shooting says the birds they left outside Daniel Andrews' office were recovered from three Victorian wetlands during the opening of the 2015 recreational duck shooting season last weekend.

The haul included a black swan, threatened freckled duck and blue-billed duck, many of which were found injured.

Anti-duck hunting campaign director Laurie Levy said Victorian upper house MP Dan Young, from the Shooters and Fishers Party, was hunting at the wetlands.

"He said all duck shooters know what they can shoot and what they can't. But we've just proven today that's a lot of spin, with these endangered and rare species found dead on the wetlands," Mr Levy told AAP on Tuesday.

Duck hunting protesters dumped 100 dead birds in front of the Victorian premier's office. (9NEWS)

The group says many smaller birds are used for target practice and are rarely collected by the hunters.

"You get a lot of injuries. The shooters are just shooting at flocks of ducks that fall down into the water and are left to die," Manfred Zabinskas, of the anti-duck hunting coalition, said.

The state government set a bag limit of 10 ducks on opening day, with five per day for the remainder of the season.

But activists say this only increases the number of dead and injured birds found on the wetlands.

"They just bag their allowed limit and continue shooting, throwing them out as they get bigger ones," activist Helen Round said.