National Lake No. 13 and also it is declared as an International Lake numbered 1572 as a Ramsar site. However, the lake at present is under threat from a variety of human induced changes to their hydrology. The lake is abundant in commercially important freshwater fish species. The families of around two thousand fishers around the lake have been facing a threat in livelihood as the lake is dying. Keeping in view the background the study was conducted to know the perception of the fishers about fish bio diversity and its conservation in the lake. Thus, altogether 140 fishers and twenty local fish traders in the vicinity of the lake were interviewed. A total of 70 fish species were reported by the fishers during the study. It was found that majority of the respondents (92.59% of active fishers, 83.72% of seasonal fishers and 90% of local fish traders) felt that the availability of the fishes in the lake have decreased drastically during last 15-20 years. Most of the respondents expressed that lack of water of the lake due to siltation and reduction in the flow of water through the major three streams and the lack of regulation to control the pollution over lake coupled with lack of sustainable fishery enhancement measures by the government departments are the major reasons for decline of fishery resources in the lake. In conclusion it can be stated that the fisheries manager need to be very creative and innovative to manage the resources. The community of fishers and the government, through a co-management arrangement will need to work together to save the glory of the lake as well as to secure the livelihood of the fishers' depending on the lake for their livelihood

Keyword: Fishers; Livelihood; Fish bio diversity; Conservation; Wet land;