Shah Alam, 62, from Alokbali union in Narsingdi Sadar upazila, has been fishing in the Brahmaputra since the age of 8, following in the footsteps of his father.

However, water pollution and encroachment have drastically reduced fish populations, forcing him to consider changing his occupation and pushing him into hard times.

Fishing, once the primary livelihood for Shah Alam's five-member family, has become increasingly unsustainable. His two sons, Jalal Mia, 20, and Helal Mia, 23, have already abandoned the ancestral occupation due to the dwindling fish population, which fails to meet the costs of living.

Many like Shah Alam are quitting fishing, unable to sustain their families due to the pollution and encroachment that have plagued the river.

In Narsingdi, parts of the Brahmaputra have become lifeless due to pollution from industrial waste and encroachment by influential individuals. Once a symbol of heritage and vitality, the river is now a shadow of its former self, its biodiversity and surrounding environment severely disrupted.

According to official data, the Brahmaputra river flows about 20 kilometres through the district.

Locals alleged influential people have built industries and houses, occupying significant portions of the river that once served as a crucial lifeline for trade and commerce in Narsingdi Sadar, Madhabdi, and Narayanganj.

Moinul Islam Miro, president of Narsingdi Paribesh Andolon, said, echoed the same.

Kamruzzaman Sarker, deputy director of Department of Environment in Narsingdi, said, "We are working to save the Brahmaputra and other rivers by taking punitive measures at different times against factories and ensuring ETP compliance."

Mohammad Rashed Hossain Chowdhury, deputy commissioner, said, "The Water Development Board has sent us a list of illegal structures to free the Brahmaputra from encroachment, and we have forwarded the list to the ministry concerned. If approved, the eviction drive will resume."