The research was conducted from January 2019 to June 2019 to study the fish production and marketing system in fish zone, Rupandehi. Altogether 95 respondents including 27 small farmers, 35 medium farmers and 33 large farmers were selected for household survey using simple random sampling for the study. Statistical tools, Ms- excel and SPSS of version 23 were used for data analysis. From the study, it was evident that, six species of carps of fingerlings size were stocked with high average number of common carps (3885.5/ha.) followed by silver carp (3880.5/ha). The average production of fish species was 6.06ton/ha which is slightly higher than the national average. The observed data revealed that, marketing of major quantity of fish was from on farm sale i.e. 55.78% followed by local market sale (18.94%), live fish sale in retailers (5.26%). Similarly, percentage of farmers selling fish to wholesaler, consumers, retailers and neighbours were 63.3%, 30.5%, 26.5% and 26.3% respectively. Cost and returns analysis showed average B/C ratio of 2.13. Problem ranking using 5 point scale value showed high cost of feed as the most serious problem with index value of 0.94 in the study area.
 T. Gurung, “Fisheries and Aquaculture Activities in Nepal,” 2003, pp. 14–19.
 K.M. Tunde Adeniyi Bashir, “Economic Analyze of Costs and Return of Fish Farming in Saki-East Local Government Area of Oyo State, Nigeria,” J. Aquac. Res. Dev., vol. 06 (02), 2015.
 S.C. Dhakal, P.P. Regmi, R.B. Thapa, S.K. Sah, and D.B. Khatri-Chhetri, “Profitability and resource use efficiency of buckwheat (Fagopyrum esculentum Moench) production in Chitwan District, Nepal,” J. Agric. Environ., vol. 16, pp. 120–131, 2015.
 T. Sharma, S.C. Dhakal, R.R. Kattel, K. Gharti, and J. Lamichhane, “Economics of fish production at Chitwan district, Nepal,” J. Agric. Nat. Resour., Vol. 1 (1), pp. 21–31, 2018.
 K. Singh, “Economics and Determinants of Fish Production and Its Effects on Family Income Inequality in West Tripura District of Tripura,” Indian Journal of Agricultural Economics, Vol. 6, p. 13, 2007.
 Md. A. Husen, “Fish Marketing System in Nepal: Present Status and Future Prospects,” Int. J. Appl. Sci. Biotechnol., Vol. 7 (1), pp. 1–5, 2019.
 A. A. Emam, “Economics of Fish Production and Marketing: A Case Study of Khartoum State, Sudan,” p. 6, 2010.
 R. Kassali, O. I. Baruwa, and B.M. Mariama, “Economics of fish production and marketing in the urban areas of Tillabery and Niamey in Niger Republic,” Rural Dev., Pp. 7, 2011.
 A. Getu and K. Misganaw, “Post-harvesting and Major Related Problems of Fish Production,” Fish. Aquac. J., Vol. 06 (04), 2015.