• Garima Choudhary
• Rabindar Kumar Singh

Abstract: During the present investigation, water samples were collected from GANDAK RIVER during the month of 2017 September to 2018 August and examining the zooplankton abundance. The density of Rotifer was lowest (4U/L) August 2017 and highest was (146U/L) in May 2017. The highest Cladocera population are recorded (30U/L) in January 2017 March and lowest was (2U/L) in August 2018. The peak of the total Copepoda was lowest (2U/L) in September 2017 and highest (36U/L) in May 2018 of the year. The interpretation of zooplankton population dynamics assumes that the species co-exist and interact in space and time. During the present investigation the zooplankton showed a bimodal pattern of the fluctuations with the primary peak in monsoon and secondary peak in winter month during the study period.

Key words : water, seasonal abundance, distribution, zooplanktons.

"Studies on the seasonal abundance and distribution of zooplankton of river Gandak, Hajipur, Bihar", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.609-611, June 2019, Available :http://www.jetir.org/papers/JETIR1908696.pdf

"Studies on the seasonal abundance and distribution of zooplankton of river Gandak, Hajipur, Bihar", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp609-611, June 2019, Available at : http://www.jetir.org/papers/JETIR1908696.pdf