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¹ Eğirdir Fisheries Research Institute, 32500, Eğirdir, Isparta, Turkey Viewed : 3909 - Downloaded : 3636 This study was conducted with species the macrobenthic algae which have been seasonally collected from 5 stations located on Beymelek Lagoon Lake and 6 other lying along the coastal areas. Besides, varying salinity rates and the temperature values of the lake depending upon its depth have been measured during the study. Seven species of Chlorophyceae (Gayralia oxysperma (Kützing) K.L. Vinogradova ex Scagel et al., Enteromorpha linza (L.) J.G. Agardh, E. prolifera (O.F. Müll.) J.G. Ag., E. intestinalis Link, Ulva rigida C. Agardh, Chaetomorpha crassa (C. Ag.) Kütz., Cladophora coelothrix (J. Ag.) Harvey) and 2 species of Rhodophyceae (Porphyra leucosticta Thuret in Le Jolis, Polysiphonia urceolata (Lightfoot)) Greville have been found to constitute the macrobenthic algae existence on Beymelek Lagoon Lake. The lake is of mesohalin characteristics in winter-spring seasons and of polihalin characteristics in summerautumn seasons. The above-mentioned macrobenthic algae except species C. crassa are all new brand floristic records for the region. This study also reveals that the algae Gayralia oxysperma, of which the seasonally changing biomass values were recorded at 5.0 - 55.3 g/m², can be exploited economically in the region. Keywords : Beymelek Lagoon, Macrobenthic, Algae