Harare, Zimbabwe (CNN) -- More than 80 elephants in Zimbabwe have been poisoned with cyanide -- the latest victims of poachers keen to feed soaring global demand for illegally trafficked ivory.
Since May, the carcasses of 87 elephants have been discovered in Hwange National Park, said Caroline Washaya-Moyo, public relations manager for Zimbabwe's Parks and Wildlife Management Authority.
The poachers poisoned natural salt licks to bring down the mighty beasts, she said Wednesday.
The parks authority has so far recovered 51 tusks, she said -- leaving 123 in the hands of the poachers.
Zimbabwe's newly appointed Environment Minister Saviour Kasukuwere told CNN that he would push for stiffer jail penalties to root out poaching in the wildlife-rich African nation.
"That will be one of my missions in the new parliament, given the recent case of elephants which were poisoned by poachers," said Kasukuwere, who has twice visited the park in recent days to see the impact of the poisoning.
Last month authorities arrested five suspected poachers after 41 elephants were found dead in the park, which is about 800 kilometers (500 miles) southwest of Harare, not far from Zimbabwe's border with Zambia. The other carcasses have been discovered since then, Washaya-Moyo said.
Three of those arrested have been convicted and are due to be sentenced this week, she said. Two investigations are ongoing.
Call for tougher action
The Zimbabwe Conservation Task Force, an anti-poaching organization, said the latest elephant deaths could have been avoided if Harare was tougher on those convicted of poaching.
"They need to be given some extensive jail time. If it was, they wouldn't carry on doing it," said the organization's chairman, Johnny Rodrigues.
He accused Zimbabwe of not doing enough to clamp down on poachers and of creating an impression that the country had more elephants than it can sustain.
"They want permission from CITES to sell the ivory they have in stock and they think they will get it if there are too many elephants here," Rodrigues said, referring to the Convention on International Trade in Endangered Species.
CITES, also known as the Washington Convention, aims to ensure that international trade in specimens of wild animals and plants is kept to a minimum to avoiding threatening their existence.
Rodrigues puts the country's elephant population at around 35,000, while Washaya-Moyo said it was about 45,000.
The use of cyanide could also have a wider impact, Rodrigues said. "When other animals and birds feed on the rotting elephant carcasses, they will also die from the poison. Hundreds of animals are now at risk," he said.
The police suspect there could be more elephant carcasses in the park that have not yet been discovered, he added.
The Parks and Wildlife Management Authority warned that wildlife poaching syndicates in Zimbabwe "have become sophisticated and need appropriate responses to effectively deal with them."
'Killed in record numbers'
The International Fund for Animal Welfare and the WWF conservation group said that a recent surge in the illicit ivory trade has resulted in the killing of 30,000 African elephants annually in recent years.
The International Fund for Animal Welfare, which published a major study into the illegal wildlife trade in June, calculates that an elephant loses its life to poaching on average every 15 minutes.
"Elephants were killed for their ivory in record numbers in 2011 and 2012, and some rhinoceros subspecies have become extinct or are on the verge of extinction," it said.
"Rangers are regularly killed by poachers, and some of the world's poorest countries continue to see their wildlife decimated for the black market in wild animals and parts. Meanwhile, the profits realized from the illegal trade in wildlife have surged to levels once reserved for legally traded precious metals.
"Criminal and violent groups around the world have become the main actors exploiting this global industry."
Demand in Asia, United States
Much of the demand for ivory, as well as rhinoceros horn, is in Asia, and particularly China, where these items are used in traditional medicines and handicraft products, the report said.
The United States is widely considered to be the second-largest destination for illegally trafficked wildlife in the world, it said, with the European Union third.
Authorities in the United States have spoken out against the illegal trade in recent weeks.
Secretary of the Interior Sally Jewell announced this month that nearly six tons of elephant ivory seized by U.S. wildlife inspectors would be destroyed to highlight the issue.
"Rising demand for ivory is fueling a renewed and horrific slaughter of elephants in Africa, threatening remaining populations across the continent," Jewell said.
"We will continue to work aggressively with the departments of Justice and State, as well as with international law enforcement agencies, to disrupt and prosecute criminals who traffic in ivory, and we encourage other nations to join us in that effort."
The ivory stockpile, which includes whole tusks as well as smaller carvings and jewelry, has been kept at a secure site in Colorado, where it will be crushed and destroyed next month. Commercial ivory trade has been banned in the United States since 1989.
The Clinton Foundation is also working with conservation groups to try to halt the gruesome trade in tusks, by combating poaching and trafficking, and by educating consumers so they no longer buy ivory.
Chelsea Clinton wrote last month that elephant poaching had reached alarmingly high levels -- and was an issue with implications for global society.
"This is not just an ecological disaster; it is an economic and security threat as well," she said. "Tourism, a vital source of income for many of the most-affected African countries, is threatened if wildlife preserves are depopulated.
"The overall black market for illegal wildlife trade has become the fourth most lucrative criminal activity internationally, after drugs, counterfeit goods and human trafficking."
CNN's Laura Smith-Spark wrote and reported in London and journalist Columbus S. Mavhunga in Harare.