The information on zooplankton community is very scarce. The only contribution available in [19] characterized this community in 1997, the macrophytes pre-removal period, and demonstrated the occurrence of trophic conditions indicator species such as rotifers Brachionus angularis, B. calyciflorus, Keratella tecta, the co-occurrence
of cyclopoids copepods Thermocyclops decipiens and Metacyclops mendocinus, the calanoid copepods Scolodiaptomus cordeiroi and the cladocerans Daphnia gessneri, Moina micrura and Moina minuta. The role of zooplankton community as indicator of ecological state in biomonitoring programs is well recognized by considering
these organisms respond quickly to changes in the water column.