Yahoo News 20 Dec 07;
Pollution authorities in the northeastern Indian state of Assam began Wednesday investigating the mysterious deaths of thousands of fish in the Brahmaputra River, officials said.
More than 1,500 dead fish have been found floating in the river, lifeline of India's northeast this week, fuelling fears that toxic chemicals are being used by fishermen.
Groups of fishermen sometimes use explosives and toxic chemicals to net fish in large quantities, authorities said.
"We have already collected water samples and some dead fish for a thorough investigation and tests," said a state pollution board official, asking not to be named because he was not authorised to speak to the press.
The state forensic science laboratory is examining the fish.
"This is something unnatural and we can be sure only after proper tests," D. J. Hazarika, a scientist at the laboratory said.
Locals in the area said they believed water pollution in the Brahmaputra, not poisoning, was behind the fish deaths.
Authorities have cautioned people against eating the dead fish.
The 2,906-kilometre (1,816-mile) river -- one of the longest in Asia -- traverses Tibet, India and Bangladesh before emptying into the Bay of Bengal.
Dead fish surface on Indian river
Subir Bhaumik, BBC News 19 Dec 07;
Thousands of dead fish have been washed ashore in a river in the north-eastern Indian state of Assam river since early this week.
They were discovered on the banks of the Brahmaputra river in the state capital, Guwahati.
An equal number of sick fish were found in the same place, officials said. They blamed rising pollution levels.
An investigation has been ordered by the Assam government, said C.K.Bhuiyan, senior district official in Guwahati.
'Zero pollution'
Earlier in the year, the Assam Pollution Control Board (APCB) told all the oil refineries in the state to achieve "zero pollution" levels by 31 December, otherwise they would be threatened with closure.
The Guwahati refinery was found to be the worst polluting refinery and was perhaps the only one in Assam not to have yet complied, pollution control board officials said.
"The marine life in the Brahmaputra river has been seriously affected by the pollution caused by these refineries, particularly the Guwahati refinery," said Jawaharlal Dutta, APCB chairman.
He alleged that pollution from these refineries was several hundred times above the permissible limits.
But district officials who are monitoring the development were not ruling out other possible causes.
"It could be a case of poisoning caused by water pollution or may be an outcome of some kind of explosion inside the water to catch fish in large numbers from the river. We are not ruling out either possibility at this moment," Mr Bhuiyan said.
Killing of fish by using explosives and chemical fertilisers or other poisonous substances is not uncommon in Assam, especially during the winter.
