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The biologist investigates reports that the Ganges is in trouble. His investigation takes him from crab-hunters in the delta to the polluted middle river in the third episode of Jeremy Wade’s Mighty Rivers

Jeremy Wade continues his exploration of the great waterways with the 2,500km Ganges.

As he travels upstream from the Bay of Bengal, he finds a shocking story of a fishless river and stretches that are entirely dead.

Jeremy Wade covers his nose against the acrid smell of pollution pouring into the River Ganges from tanneries in the industrial city of Kanpur, India

Jeremy covers his nose against the acrid smell of pollution pouring into the River Ganges from tanneries in the industrial city of Kanpur, India

But there is hope, in the shape of airborne cameras to catch industrial polluters, and, far, far upstream, Jeremy gets out his fishing rod to try catching the legendary mahseer fish (pictured, top).

Jeremy Wade in front of pollution pouring into the River Ganges

Jeremy at another site where the Ganges is a sewer

TV Times rating: ****