Sujeet Kumar* & Sushama Kumari
Department of Zoology, R N College, Hajipur, Vaishali, Bihar, India
Received : 21st January, 2021 ; Revised : 20th February, 2021
Abstract– In the present project, a comprehensive study was done on Diurnal variations in zooplankton in the waters of Taj Baj ka pokhra and Mamu-Bhanja ka pokhra of Hajipur town, Bihar. The pond is situated in the heart of the town and is of utmost importance on account of its historical aspect. Different varieties of fishes are cultured in this pond. Especially carp culture is common. Hajipur town is an important part of Vaishali district. Fresh water of Taj Baj ka pokhra and Mamu-Bhanja ka pokhra of Hajipur town, Bihar have been selected for research work. For analysis of dial variation of zooplankton, samples were collected from two perennial ponds i.e. Taj Baj ka pokhra and Mamu-Bhanja ka pokhra of Hajipur town. In this DIAL study, zooplankton including rotifers, cladocerans, copepods and their larvae show a definite diurnal pattern with a decrease in daylight hours and an increase in morning hours over the three seasons in both ponds. Current data indicate that zooplanktonic organisms avoid bright light and take shelter at the soil-water interface during the day and later climb to the surface at night. In the study we found a total of 15 species of zooplankton and 13 species of zooplankton collected in Taj Baj ka pokhra and Mamu-Bhanja ka pokhra of Hajipur town during the mid-summer season, during the dial cycle of the monsoon month, total 12 species and 11 species of zooplankton in both the ponds were collected and a total of 2 species of copepoda and their nauplii larvae were collected in each of the two ponds during the winter month.