In a worrying trend, there has been a reduction of nearly 30 per cent in the total fish species in the Ganga river in India between 2016-2020, owing to changes in the hydrological structure due to dam construction, land modification, pollution, industrial effluents and illegal fishing activities, according to a central government assessment.
The Central Inland Fisheries Research Institute (CIFRI), Kolkata, under the Ministry of Agriculture carried out quarterly field sampling from April 2016 to March 2020 to understand the distribution and current status of fish species on the IUCN (International Union for Conservation of Nature) Red List along the entire stretch of the Ganga.
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https://www.newindianexpress.com/nation/2021/sep/08/nearly-30-per-cent-reduction-in-fish-species-in-ganga-in-four-years-says-study-by-centre-2356097.html