The River Halda is one of the important natural breeding grounds of Indian major carp (Labeo rohita, Labeo calbasu, Gibelion catla, Cirrhinus mrigala) in Bangladesh for its unique physicochemical and biological properties of water. The productivity of the Halda ecosystem mainly depends on the plankton diversity. Zooplankton directly affects the productivity of the Halda River ecosystem. Research work was conducted for the two years extending from January 2017 to December 2018 to identify the zooplankton community of the Halda River. A total of 71 species of zooplankton under 37 genera belonging to 9 groups were identified. The dominant group of zooplankton was 44 species of Rotifers (61.98 %) followed by 12 species of Copepods (12.68 %), 5 species of Cladocerans (7.05 %), 3 species of Protozoans (4.22 %), 2 species of Mollusks larvae (2.82 %), 2 species of Insects (2.82 %), 1 species of Cnidarian (1.41 %), 1 species of Nematode (1.41 %) and 1 species of Ostracod (1.41 %). Therefore, the water body of the Halda is eutrophic in its nature
