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¹ Ege University, Faculty of Fisheries, Department of Aquaculture, 35440, İskele-Urla, İzmir, Turkey Viewed : 3748 - Downloaded : 2230 In this study, effects of different light intensities on development and hatching success of European squid (Loligo vulgaris Lamarck, 1798) eggs were investigated. In the experiments, L. vulgaris’s eggs were separately incubated at 600 lux, 140 lux, 33 lux, 9.5 lux, and 2.5 lux light intensity levels for 24 h. During the experiments, sea water temperature and salinity were measured as 14.3±1.8°C and 37±0.5 ppt. The hatching occurred between 36 and 49 days at 600 lux, 39 and 54 days at 140 lux, 39 and 53 days at 33 lux, 43 and 61 days at 9.5 lux, and 40 and 55 days at 2.5 lux light intensity levels. The maximum hatching rates and hatching success of the eggs were determined as 99.7% at 33 lux and 95.2% at 9.5 lux, respectively. Keywords : Loligo vulgaris, squid, egg, hatching, light intensity