ANTARYAMI KUMAR ADHISHWAR AND SUNIL KUMAR CHOUDHARY*
Abstract
The Primary Productivity of phytoplankton of Gogabil Lake, Katihar has been assessed for two years from October, 2009 to September, 2011. The net and Gross Primary Productivity (GPP) was recorded with maximum value of 1.69 gC/m3/d and 2.53 gC/m3/d, while the minimum were 0.08 gc/ m3/d and 0.42 gC/m3/d respectively. The community respiration ranged between 0.17 gC/m3/d to 1.18 gC/m3/d. The ratio of NPP and GPP fluctuated from 0.11 to 0.91. The P/R ratio was found to vary between 0.12 to 9.96. Net Primary Productivity (NPP) value and P/R ratio indicated eutrophic nature of Gogabil Lake.