Centre has launched the first ever across-the-river survey in Ganga to determine the population of aquatic life, including that of the endangered Gangetic doplhin. <br/><br/>The study is crucial as the animal population in a river indicates the quality of its water. National Mission for Clean Ganga has said that the survey will create a baseline scientific data for the government to take suitable measures to improve quality of the river water. <br/><br/>The first leg of the census was launched on March 1 from Narora to Bijnor in Uttar Pradesh. A study to figure out fish species composition in the 2525 km-long river has been also been kick started from Harshil in Uttarakhand. <br/><br/><br/>