Studies on the benthos of Lake Hayq were carried out at three stations from November, 2008 tornApril, 2009. Bottom samples were collected by using an Ekman grab (225cm2). Determinationrnof total organic matter of littoral and profoundal samples was done using an oven and a mufflernfurnace. Communities of benthic fauna were reported from the lake in relation to the type ofrnbottom substrates and aquatic macrophytes. The benthic macroinvertebrates of the bottom nearrnto the emergent and submerged vegetation and the vegetation-free region of the lake werernidentified and their distribution in the lake was recorded in relation to the total organic matterrnand texture of the bottom sediment. Mollusks were found to be the most numerous of allrnbenthic communities (mean number 52306individual/m-2). The Dipetra larvae were next withrnChironomidae accounting the highest number. Bottom samples taken from near the vegetatedrnregions of the lake were found to have a silt texture and the vegetation-free zone was sandy inrntexture. The result shows that near vegetated regions of the lake bottom had higher organicrnmatter content than the bottom of the non-vegetated region. The sub-littoral region had highestrnrichness (d = 2.13) while, the highest diversity (H = 1.8), evenness (J (e) = 0.209) andrncommunity density (43673.77 ind|m2) were in the littoral region. It was observed that mostrnbenthic taxa of Lake Hayq were concentrated in the littoral and sub littoral region inrnassociation with macrophytes. The littoral and sub littoral zone can therefore be considered as arnsite of good habitat and breeding ground for macroinvertebrates. Since there is considerablerndependence of many commercial fish species on the invertebrate fauna as food resource, therernis need to investigate further the biology and ecology of the benthic organisms and weed beds.rnIt is also important that lake management should maintain the integrity and health of thernmacrophytes of the lake.rnKey words: Benthic macroinvertebrate, Ekman grab, Littoral, Macrophytes, Profoundal,rnShannon diversity index, Sub-littoral