TORONTO — The chief of the Grassy Narrows First Nation in northern Ontario says the federal and provincial governments must help his community overcome the effects of decades of mercury poisoning.

Japanese researchers found more than 90 per cent of the people in Grassy Narrows and the Wabaseemoong (Whitedog) First Nation show signs of mercury poisoning, including a new generation of residents.

The researchers say people who were not born when mercury was dumped into the English and Wabigoon River systems by a paper mill in Dryden, Ont., in the 1960s show symptoms of mercury poisoning.

Chief Simon Fobister Sr. calls it "shameful" that communities and people impacted by mercury poisoning have to fight for every bit of help they can get, and says he still wants a commitment from the province to clean up the local river.

Fobister says there must be financial assistance for people suffering from mercury poisoning and help to restore the local economy, which was devastated in the 1970s when their commercial fishery was shut down because of the contamination.

Masanori Hanada of Kumamoto Gakuen University has studied mercury poisoning in the Japanese town of Minamata, where the first human patient of what later became known as Minamata disease was identified.

Hanada has also been the lead organizer of followup research trips to Grassy Narrows since 2004, and says the majority of the population is experiencing sensory deprivation, starting with the loss of feeling in fingers and toes.

"The mercury levels in the fish in the English and Wabigoon River are still high," Hanada said Tuesday as he released the results of his studies. "This confirms there is still mercury in the river system."

The symptoms of mercury poisoning can include usually permanent impairment of brain functions such as speech, sight and hearing, in addition to convulsions, uncontrollable limb movements and loss of balance.

Hanada called the fact that young people are affected by mercury poisoning "surprising," and said more research is needed to determine the root cause of their symptoms.

Another report in June found mercury levels in Grassy Narrows remain dangerously high even though the plant that dumped 9,000 kilograms of it into the water closed in the 1970s, and suggested there may be an ongoing source of contamination.

Fobister called for an investigation after a former worker at the Dryden mill wrote the government saying he had buried more than 50 barrels of mercury and salt in a pit in 1972.

The environment ministry took some samples from the area last June in response to the claim, but the government said Tuesday it was not in a position yet to share the results.

Fobister wants the government to act on a report that said the mercury in the river can be safely cleaned up.

"There's been no real, solid, clear commitment that a cleanup will take place if the scientists say it can be cleaned up," he said.

Premier Kathleen Wynne has said the government is reluctant to take any steps that could make the situation worse by stirring up mercury in the sediment of rivers and lakes.

Fobister admits many residents ignored the order to stop eating fish when the government closed the local fishery the 1970s.

"We have been heavy consumers of fish over those decades, and many of our people have symptoms of mercury poisoning," he said.

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Keith Leslie, The Canadian Press