This lake sanctuary is a big attraction for migratory ducks from Siberian region during winter. One can see thousands of ducks in the swamp area between Shahnahar barrage and Pongdam and the surrounding shallow waters of the lake. Clean blue water all around with the panoramic view of Dhauladhar Ranges and Kangra Valley make the visit to Ransar Island an unforgettable experience.
In 1983, the Sagar was declared a wildlife sanctuary and over 2,20 species of bird belonging to 54 families have been sighted over the waters and the fringing mud-banks-these include black - headed gulls, plovers, terns, ducks, water-fowl and egrets.
The land portion of the sanctuary has barking deer, sambar, wild borars, nilgai, leopards and claw-less others.
Twenty-seven species and sub-species of fish belonging to six families have been recorded in the Sagar's waters. Some of the important commercial varieties are - Labeo dero (Gid), Labeo rohita, Labeo Calbasu, Tor putitora (Mahsir), and Mystus seenghala (Singhara). Since 1976, fishing has been a major economic activity in the areas and today, this provides employment to some 1,500 fishermen and the annual catch is valued at over a corore rupees.