Explanation:

Ganga dolphin was counted in the year 2017-18 using scientific techniques in Gandak, Koshi, Mahananda and Ganga in the state, which found its number 1464 On 22 August 1990, the Ganga mainstay of up to a length of 60 km between Sultanganj to Kahalgaon in Bhagalpur district was notified as Vikramshila Ganga Dolphin Ashrani. It is the only Ganga Dolphin sanctuary in the country. Apart from this, Centered Dolphin Eco Tourism and Conservation Center cum Park has been set up to promote Eco Tourism in Munger District.