Study on Zooplankton of Fresh Water Reservoir Nyari II Rajkot district,Gujarat, India

摘要

Zooplankton are the grazers on the phytoplankton and a food base for the carnivorous as well as omnivorous fishes, have been reported in percentage composition of different groups. The diversity of various types of zooplankton was studied of fresh water reservoir Nyari – II Rajkot district, Gujarat. The planktonic forms were collected from the surface of the reservoir water with plankton net of 20- mesh size nylon cloth. The plankton samples were preserved for laboratory analysis. The collected samples were identified using standard references. The result revealed that the zooplankton were represented by various phyla like, protozoa, helminthes, rotifera, annelida, arthropoda etc. Arthropods have been reported maximum in number of varieties and percentage amount in the total zooplankton followed by Rotifer in general. The range of zooplankton between 174 to 769 n/l, and average was 378.42 n/l, the minimum zooplankton was in March and maximum were in the month of October. The annual percentage composition of various representative groups of zooplankton revealed 7.90% protozoa, 35.32% Rotifer, 5.41% Arthropoda and Miscellaneous 2.64%. The detailed aspect of monthly variation, percentage composition and diversity of zooplankton is discussed herein.