Various research components invertebrate species of freshwater in 02 reservoirs (Ho Tay and Dak R'Tang) Dak Nong province, was conducted from 05/2015 - 05/2016. The research results had identified a total of 14 species of macroinvertebrates. In which, there are 12 species in the Tay lake they were belong 11 genuses, 9 families and 5 orders; Dak R'Tang lake had 13 species of 12 genuses, 9 families and 5 orders. The variation in species composition between rainy season and dry season was negligible (In Tay lake, the rainy season had 11 species, the dry season had 12). The Dak R'Tanglake had 13 species the dry season and had9 speciesin the rainy season. The number of species of zooplankton in 02 lakes were quite diverse. Tay lake identified 50 species, lake Dak R'Tang identified 46 species. Both the number of species and biomass of zooplankton were seasonal fluctuations: the most diverse species composition at the end of the dry season (50 speciesin Tay lake, 46 species in R'Tang Dak lake) and the lowest at the end of the rainy season (13 species in Tay lake, 12 species in , Dak R'Tang lake). The zooplankton biomass in Tay Lake ranged from 190467-262333 individuals/m3, Dak R'Tang lake ranged from109334-167374individuals/m3.Keywords: macroinvertebrates, zooplankton, biomass, Tay lake, Đak R’Tang lake, Đak Nong.SPECIES DIVERSITY INGREDIENTS invertebrate FRESHWATER RESERVOIR IN 02 (TAY HO AND R'TANG DAK) in Dak Nong province
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