Fisheries Department today seized 100 kg of fish preserved in toxic chemical Formalin at the fish market in the Kumbakonam four-road junction near here, officials said.
Acting on a tip-off, the department personnel raided the market and seized the fish.
Fishmongers said the catch did not belong to them, they said.
The Formalin-mixed fish would cause cancer, allergy and several other diseases, they added.
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