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¹ İzmir Katip Çelebi University, Faculty of Fisheries, Department of Aquaculture, İzmir, Turkey DOI : 10.4194/1303-2712-v19_4_04 Viewed : 3383 - Downloaded : 2993 In this study, the embryonic development of pink dentex (Dentex gibbosus Rafinesque, 1810) eggs were investigated in detail by using groundwater in aquacultural conditions. Groundwater at 35‰ salinity and 19.5°C temperature was used during the experiment. The eggs were obtained by applying hormone to the D. gibbosus broodstocks which were caught in nature and grown in a hatchery. The average diameters of the eggs and oil globule were 0.7252±0.020 mm and 0.1517±0.015 mm respectively. In order to investgate the embryonic developmental stages of the eggs, photographs were taken in every 15 minutes until the stage of the morula, and then, at hourly intervals. Following the fertilization of the eggs, the morula stage, the gastrula stage, the neurula stage, the somit formation and the kupffer vesicle formation were occured at 3.42th, 8.30th, 14.21th, 18.13th hours, respectively. Hatching occured after 39.41 hours from fertilization. Hatching rates were determined as 86%, 8 %, and 89% at 19.5±0.3 °C. The length of the newly hatched prelarvae were measured around 2.52±0.045 mm. Keywords : Pink dentex, Embryogenesis, Hatching ratio, Egg diameter