The pollution from a unit of Formosa Plastics Group also decimated tourism in four provinces, the Thanh Nien newspaper today quoted the government saying in a report to the National Assembly.
Formosa acknowledged late last month that it was responsible for the pollution and pledged to pay $500 million to clean it up and compensate affected people.
An estimated 115 tonnes of fish washed ashore along more than 200 kilometers of Vietnam's central coast in April, the report said, adding 140 tons of farmed fish and 67 tons of farmed clams have died.
The report said the government must learn from the incident and carry out proper oversight of the environment, especially when the country wants to attract more foreign investment following the signing of the 12-member trade pact, the Trans Pacific Partnership, that includes the United States and Japan.
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In a speech to the National Assembly broadcast live on state television Friday, Minister of Natural Resources and Environment Tran Hong Ha said Formosa has paid the first amount of $250 million. The report said the government will begin to compensate affected people next month.
A preliminary assessment of the damage showed the pollution affected 450 hectares of coral reefs, of which 40 to 60 per cent were destroyed. Some groups of sea creatures were depleted by half.
The report said most small fishing vessels did not sail because the near shore waters contained no fish or seafood to catch. Trawlers that were able to go farther out to sea, beyond the polluted waters, were the main vessels able to operate, the report said.