Phytoplankton is one of the key suppliers of energy in aquatic ecosystem. phytoplankton abundance,
composition and activity affect dynamics of other organisms. Since, phytoplankton abundance and growth
condition is important to elucidate fisheries; therefore their abundance was examined from January to
December 2006. A total of twenttthree phytoplankton species were collected, where the mean monthly
abundance was 2.0 xi03 cells.mL· , with relatively higher values during June, August and November (3.1-
4.09 xl03 cells.mL" 1
). The predominant phytoplankton were Microcystis aeruginosa, Merismopedia
tennuissima and Peridinium sp. Among all Dinophyceae and Cyanophyceae increased significantly (P<0.05)
with increasing total phosphorous. The current trend of phytoplankton abundance has been discussed in
relation to fisheries management in Lake Phewa.

Phytoplankton is one of the key suppliers of energy in aquatic ecosystem. phytoplankton abundance,
composition and activity affect dynamics of other organisms. Since, phytoplankton abundance and growth
condition is important to elucidate fisheries; therefore their abundance was examined from January to
December 2006. A total of twenttthree phytoplankton species were collected, where the mean monthly
abundance was 2.0 xi03 cells.mL· , with relatively higher values during June, August and November (3.1-
4.09 xl03 cells.mL" 1
). The predominant phytoplankton were Microcystis aeruginosa, Merismopedia
tennuissima and Peridinium sp. Among all Dinophyceae and Cyanophyceae increased significantly (P<0.05)
with increasing total phosphorous. The current trend of phytoplankton abundance has been discussed in
relation to fisheries management in Lake Phewa.