Spread over an area of 40.1 sq km, the lake, which is listed in the Ramsar Convention, supports livelihood of over 1,200 families living in 12 villages around it.
Fishermen complain that the fish output has become unpredictable over the last few years after elephants, which cleared the waterbody by feeding on the lake vegetation, stopped visiting it because of the presence of a railway line on the southern boundary of the wetland.
He says that elephants are crucial to fishing as the large mammals clear the waterbody which gets congested with waterweeds, hyacinth and other vegetation.
"They clear the lake for us and the year they do not come, the fish production decreases," another fisherman said, adding that last year the production was three times less.
Guwahati goes to poll on April 24.
Laxman Teron, a paddy farmer in one of the villages encircling the lake, complains that when the elephants are not able to go and eat in the wetland they get angry and attack their fields.