Physiological observation on activity recovery of mercury exposed fresh water fish were done by using aquatic weeds. Five weeds constitute two floating weeds Eichhornia and Salvinia in surface layers. Chara and Hydrilla in the column layer and Vallisneria in bottom layer. Five experimental groups constituting five selected weeds were subjected to establish fish lethal concentration of... https://www.nacrack.com/deal-alert-Dea-Eyewear-Jemma-deal-zone/