Macrophytes, the aquatic macroscopic plants confine themselves to the shallow euphotic zone of the water bodies. In the littoral zone, macrophytes are the chief exploiters of plant nutrients from the sediments, which otherwise, are lost temporarily from the water. The nutrients so logged in the body material are released only after death, decay and subsequent mineralization, thus, they play a role in nutrient dynamics and primary productivity of shallow systems. Therefore, seasonal growth rate patterns and population dynamics of macrophytes are very important. Macrophytes grow profusely when there is enough room for colonization and abundant availability of nutrients,. They assimilate nutrients directly into their tissues. The inlet, middle, outlet and shoreline portion of lake is covered by macrophytes. There were mainly 7 species found in the lake. Alternanthera philoxeroides, Ludwigia perennis, Typha angustata, Cyperus sp, Lemna gibba, Eichhornia crassipes (water hyacinth), Pistia stratiotes were the main macrophyte species found in the lake (Figure 7). Alternanthera philoxeroides sand Eichhornia crassipes were the dominant macrophytes present in the lake. These indicate high amount of nutrient and other pollution load in the lake.Water hyacinth wide spread occurrence in the fresh water lakes is  harmful  to  fishing  (depleting  DO)  depleting water content from the water bodies and interfering in water  utilization  and  other  activities.  Water hyacinth by its abundance of leaves, dense vegetation and innumerable rootlets in tertiary manner obstruct water flow and displaces many other macrophytes, and suppresses the phytoplankton growth.

Algal specie found in the lake: During our earlier studies (Ramachandraet.al, 2013) there was a good diversity of algae (64 species) found in the lake. During this study the lake was dominated by Spirulina spp (figure 8).