Correct Answer : 5th October
In India, the ‘Ganga River Dolphin Day’ is observed every year on 5th October, to raise awareness and encourage conservation of Ganga River Dolphins. It was on this day in 2010, that Ganga Dolphins were declared national aquatic animals. Then, in 2012, the World Wide Fund for Nature (WWF) and the Uttar Pradesh government jointly began the dolphin conservation campaign in the country.