The administration also asked people not to consume water of Mawer nallah in Langate area in the district, the spokesman said.
"As reported by the Assistant Commissioner Revenue Kupwara, a few miscreants have poured some chemical in Mawer nallah, which has resulted in a large scale death of fish," he said.
He said a fish farm on the stream has also been affected.
Authorities have been asked to conduct an investigation into the matter and take action against the miscreants, he added.
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