Biodiversity of Zooplankton in a floodplain lake of the Barak Valley, Assam (North-East, India).

Zooplankton form a food support of any aquatic ecosystem, and have been reported in percentage composition of different groups. The diversity of various types of zooplankton was studied and the result revealed that the zooplankton was represented by various genera viz., cladocera, rotifera, copepoda and ostracoda. The numbers of varieties of group rotifera have been reported maximum but the percentage amount of cladocera group followed by rotifera in general. The range of total zooplankton between 253 No-ml to 622 No-ml and average was 430.42 No-ml. The annual percentage composition of various representative groups revealed 38.84% cladocera, 37.13% rotifera, 23.56% copepoda and 0.46% ostracoda. The detailed aspect of seasonal variation, percentage composition and diversity of zooplankton is discussed herein.