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In order to determine the benthic faunal composition of the Tahtal? Reservoir, which has al-most 23 km² surface area and is located in 40 km south of Izmir, samples were taken from three stations between May 2006 and April 2007 in monthly intervals. As a result of the study, 14 taxa were determined. Of the determined taxa, 4 species (Limnodrilus hoffmeisteri, Limno-drilus udekemianus, Aulodrilus pigueti, Dero digitata) belong to Annelida, 9 species (Chi-ronomus plumosus, Chironomus (Camptochironomus) tentans, Cryptocladopelma laccophila, Microchironomus tener, Polypedilum nubeculosum, Polypedilum (Tripodura) scalaenum, Cri-cotopus (Isocladius) intersectus, Psectrocladius (Psectrocladius) limbatellus, Procladius (Holotanypus) sp.) to Chironomidae and a species (Pontogammarus robustoides) belongs to Amphipoda. When the results were carried out quantitatively, 82% of the macrobenthic invertebrate fauna of the reservoir was represented by Chironomidae larvae. Similarly, 17% and 1% of the fauna were represented by Oligochaeta and Amphipoda specimens, respectively. Meanly, 452 ind/ m² were found on the bottom of the reservoir. Among the investigated stations, the richest one was the third station (53.33%) followed by the second (34.55%) and the first one (10.12%), respectively. The second station was the richest one (12 taxa) and followed by the third (10 taxa) and first (6 taxa) ones, qualitatively.
Macrobenthic, Fauna, Tahtalı Reservoir, Izmir, Aquatic (both freshwater and marine) systems, Aquatic health management, Fresh water fisheries