A whistleblower has slammed Victoria's hunting regulator.

An independent review recently found the state’s Game Management Authority (GMA) has been failing its responsibilities.

Former manager of compliance George Bucchorn, claims the GMA does not investigate hunters with rigour when they are accused of breaking hunting laws.

“They don't have the skills and they don't have the will to investigate,” he told the ABC.

“You can't regulate hunting with the resources that they have so it was almost destined to fail.

“They do not have the capability or the capacity to control hunters.”

Mr Bucchorn - a former homicide detective – said that regulator would not allow him to apply for search warrants or obtain improved monitoring equipment.

“The GMA were actively trying to discourage me from investigating,” he said.

“I was directed not to make any reference to cruelty or the code of practice that hunters should abide by.”

He told reporters that just five compliance officers were tasked with overseeing thousands of hunters on Victoria's wetlands.

GMA says it takes “any suggestion of wrongdoing seriously”.

“We can confirm that there is already an investigation into these matters, however we cannot provide more detail about this investigation at this time,” a GMA spokesperson said.

“So far the overwhelming majority of duck hunters and activists have complied with the rules and regulations of this year's duck hunting season.”

Mr Bucchorn resigned earlier this year, citing “many ongoing concerns” with the GMA.

“If nothing changes, hunters will still carry on and behave the way they are. They can't self-regulate and eventually public opinion will put a stop to hunting, to game hunting,” he said.