Ghaziabad: The heavy discharge of industrial effluents has severely affected aquatic fauna at the Ramsar site, set up in River Ganga in 165 km stretch from Bijnore to Narora in Uttar Pradesh. Ramsar sites are a tag for critical water bodies across the globe. Discharge of toxic wastes such as methane has led to decline in the population Gangetic dolphins from 126 to only 28 in the last five years. The site was set up by the World Wildlife Fund in 2005 for the protection of water bodies from getting contaminated, wildlife officials said. Besides the decrease in dolphin numbers, officials have also recovered bodies of many fish species, crocodiles and tortoises.