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¹ Ege University Faculty of Fisheries 35440 Urla, Izmir, Turkey DOI : 10.4194/1303-2712-v13_2_18 Viewed : 4946 - Downloaded : 4744 This paper provides the analysis the moon phase’s on CPUE (Catch per Unit Effort) related to Turkish Aegean swordfish (Xiphias gladius) gillnet fishery during 2009-2010 fishing seasons. Mean CPUE (kg/km) was 47.0 ±14.5 during the dark period, against 24.1 ±3.8 in light period in 2009. Besides, mean CPUE was 56.3 ±10.2 during the dark period, whereas 45.1 ±7.8 in light period in 2010. In the two years periods (2009-2010) examined, the mean CPUE was 50.5 ±9.7 during the dark period, while 32.8 ±4.1 in light period. All the CPUE peaks were clearly close to each new moon phase and the highest peak (300 kg/km) was computed in May 2009 during the dark period. The results obviously indicate the increasing of the swordfish landings during the dark periods. Keywords : Swordfish, Xiphias gladius, CPUE, moon phases, Aegean Sea