Bihar authorities have issued a health warning after unusual and unidentified fish were found in flood hit areas of West Champaran and Gopalganj. The fish have appeared as floodwaters from Nepal spread through parts of the Gandak basin. Officials have asked people not to eat, buy or sell fish whose identity is not confirmed.

The fisheries division of Bihar dairy, fisheries and animal resources department issued the advisory after reports of unfamiliar fish being found in floodwaters, local water bodies and low lying areas. Officials said floods can carry fish away from their normal habitats and expose them to polluted water. Doctors have warned that fish found in floodwater may come into contact with drains, animal waste, dead animals and other pollutants. This can increase the risk of bacterial, viral and fungal contamination. Authorities have therefore advised residents to avoid taking risks with unknown fish.

People who have already eaten fish from flood affected areas should watch for symptoms such as vomiting, diarrhoea, stomach pain, dizziness or breathing problems. Anyone developing such symptoms has been advised to seek medical help immediately.

Experts said many of the unusual fish reported in the Gandak region are believed to be goonch catfish, scientifically known as Bagarius bagarius. While the fish is eaten by some local communities, experts warned that it can spoil quickly after death and may become unsafe if it deteriorates. The government has urged people to follow the advisory until the fish are properly identified and declared safe for consumption.