More than 80 dead ducks have been dumped outside Premier Denis Napthine's Melbourne office following the opening of the annual duck hunting season on the weekend.

The Coalition Against Duck Shooting says 33 of the birds are protected freckled ducks and were shot at Lake Lonsdale near Stawell, in western Victoria.

Coalition spokesman Laurie Levy says hunters who kill those ducks are supposed to be fined but there are not enough compliance officers patrolling the state's waterways.

"There's only really three compliance officers for the whole of the state," he said.

"Of course for the opening weekend they bring in other staff from Parks Victoria and the timber industry to try and make up the numbers but it's a farce."