The devastating floods in Nepal have triggered an unusual development downstream, with unfamiliar and unusually large fish in parts of Bihar.
But what might appear to be a rare catch for fishermen has prompted a serious health warning from the Bihar government.
The Dairy, Fisheries and Animal Resources Department in Bihar has advised people to avoid buying, selling or eating fish that are washed out from floodwater.
The warning comes after reports that unidentified and unusual fish have reached some areas of Bihar through rivers swollen by floodwater flowing from Nepal.
Why Are These Fish Reaching Bihar
The flooding in Nepal has caused massive volumes of water to flow through the Narayani-Gandak river system toward India. The powerful currents have drawn fish from different water bodies downstream, some of them not common in local catches.
Gopalganj sources also reported large fish caught in the Gandak River. Fishermen have said some have caught several kilograms and some fish are much bigger.
But the appearance of these fish has attracted attention and officials are warning that any strange catch should not be taken as a sure bet to be eaten.
What Makes Floodwater Fish Risky
According to the Bihar fisheries department, fish caught in floods can come into contact with sewage, dead animals, contaminated water, and other pollutants. Such exposure leads to bacterial, viral and fungal contamination.
The department has therefore advised people to avoid eating fish from floodwater, and people to stay away from fish that have been caught in floodwater until conditions improve and the water levels get back to normal in the system and water bodies are back to normal.
बाढीसँगै नदीमा बगेर आएका माछा तथा अन्य नदीजन्य खाद्यपदार्थमा सेवन नगर्नहुन अनुरोध । pic.twitter.com/iEZJJ1YaiC
— Nepal Police (@NepalPoliceHQ) August 31, 2026
It has also advised people against eating fish that are unfamiliar or strange and that are potentially toxic to them.
Most of all, the warning is especially important because people have said they have fallen ill when they eat fish brought in with the floodwater.
Residents are ordered not to spread rumours and should seek out and confirm fish identification with fisheries officials.
What Should People Do
Residents are warned not to buy, sell or eat fish that have been caught from floodwaters. If an unfamiliar fish is found, local fisheries officials or the administration should be informed rather than assuming it is safe.
People who develop symptoms like vomiting, diarrhoea, abdominal pain, dizziness, breathing difficulty or other unusual symptoms after eating questionable fish may need to seek medical attention.
The advisory comes as Bihar continues to cope with the downstream effects of flooding that came after the Nepal disaster.
The situation is illustrative of the secondary health risks that floods may bring, even after water flows away from the worst-hit areas.
So officials are advising residents to be cautious: A fish caught in floodwater may appear to be worth a lot of money but it should not be brought to the dinner table without proper identification and safety confirmation.
