WHO poisoned and killed six Fraser Island dingoes will be the the focus of an investigation by the Queensland Parks and Wildlife Service.
The six dingoes found dead on the island have all showed signs consistent with poisoning.
Save Fraser Island Dingoes spokesman Ray Revill said the six dingoes could be related.
"There's a strong possibility it's a family of dingoes from the Eurong area - one of them was tagged," he said.
Mr Revill said about 39 dingoes had been killed in the past 18 months.
"There's been deliberate vehicle strikes, bludgeoning of animals, I believe there have been a couple of shootings," he said.
"The numbers are already at a dangerous low."
Mr Revill's voice cracked as he described the mentality of a person who could inflict pain on endangered dingoes.
"I don't know what their mentality - it's probably a strong hatred of dingoes. There are people around who do have a strong hatred," he said.
"I want to see the person responsible caught and taken to task - serve a long jail sentence and a massive fine, put the money back into conservation.
"I'm pretty angry about it."
Queensland National Parks Minister Steven Miles said the results of toxicology testing had not been received, but preliminary necropsy reports pointed to all of the animals suffering the same symptoms which led to their deaths.
"These symptoms were consistent with 1080 poisoning but we will not know for certain until the toxicology results are received," Dr Miles said.
"The Queensland Parks and Wildlife Service will pursue all avenues in this investigation to establish just what has happened and who is behind these killings.
"Any individuals found to be involved can expect to be pursued to the maximum extent possible under the law."
The use of 1080 bait is registered in Queensland for the control of wild dogs, feral pigs, rabbits and foxes.
Dr Miles said the carcasses of six dingoes were recovered from the Orchid Beach area of Fraser Island after reports of deceased dingoes were first received on June 17.
One of the animals had been buried in a shallow grave.
The maximum penalty for killing dingoes in a protected area is $353,400 or two years' in jail but Dr Miles said in this case, other penalties could potentially apply.
Scientific studies have shown the population of dingoes on the island fluctuates seasonally between about 100 and 200 animals.
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