Diverse studies the composition of animal species of freshwater invertebrate in 2 reservoirs (West Lake and Dak R'Tang) in Dak Nong province, was conducted from 05/2015-05/2016. Research results have identified a total of 14 species of invertebrate animals. In which the West Lake of 12 species of the 11 varieties, 9 of them, 5; Dak R'Tang Lake has 13 species of 12 varieties, 9 of them, 5. The species composition fluctuations between wet and dry season in West Lake not significant (the rainy season has 11 species, the dry season has 12). In indoor dry season has R'Tang Dak 13 species, the rainy season has 9 species. The number of the component species of zooplankton in Lake 2nd quite diverse. West Lake identified 50 species, outdoor Dak R'Tang identified the 46 species. Both the number of species and density are seasonal fluctuations in amount of students: the most diverse species composition at the end of the dry season (West Lake 50 species, the Lake of R'Tang Dak 46 species) and lowest at the end of the rainy season (West Lake 13 species, Dak R'Tang Lake 12 species). Zooplankton density in the study period in the West Lake from the 190,467-the 262,333/m3, Dak R'Tang Lake range from 109,334-my 167,374/m3.Keywords: large invertebrate animals, animal biomass, famous West Lake, the Lake of Đắk'R Tang, Dak Nong.
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