The study was conducted at fish marketing system in Swarighat, Dhaka, attempts to study of existing marketing system, economic features of marketing activities and inefficiencies. This paper attempts to identify infrastructure facilities, present market structure, nature of costs, profit margins and the factor influence the marketing system. In Swarighat, almost all fish traded internally move through the privet sector where a large number of people are dealing with fish distribution and marketing system. The market chain from producers to retailers goes onward through a number of intermediaries: traders, broker, aratdar, wholesalers, mahajans, and dadondars. On the basis of a sample of 20 traders from the market, the usual amount of the daily turnover of fish in this market is between Tk 2.5 and 3 million and the volume varies relying on the variation in catches during peak or off-season. Virtually most of the fish (Near about 60%) is locally supplied, near about 40% brings in from all over the country including Cox’s Bazar, Teknaf, Chittagong, Mohangang, Chandpur, Barisal, Kuliarchar, Jessor and Satkhira, Khulna, Bicrompur, Mymensingh. The marine fish supply and freshwater fish supply amount is near about 20% and 80% respectively. It is estimated that near about 15% of fish supplied in markets is Indian major carps, 10% exotic carps, 5% other carps, 25% hilsa, 10% catfish, 5% snake-heads, 3% live-fish, 5% small indigenous fish, 7% prawn and shrimp, 5% tilapia and 10% others including small chingri and marine fishes. Market structure, species quality, size and weight have an influence on the price of fish and it was obtained from the survey that the price of fish increases per kilogram with size and species wise. A great amount of profit is made by all traders in the market in a successful manner.[Nature and Science 2010; 8 (12): 96-103](ISSN: 1545-0740).