Fisheries has an important role in agro-based economy of Bangladesh, contributing 63% of total animal protein intake. The population is increasing day by day and the total fish production is unable to cope up with it. Polyculture is a technique through which we get maximum out-put. It gives higher fish production than monoculture because of utilization of available natural food by fish in the pond. Silvercarp (Hypophthalmichthys molitrix) as an important species for polyculture because of its higher growth rate (Wahab et al., 1995) but the addition of this fish in mola-carp-...