The aim of this study is to investigate genetic structure in five Dicentrarchus labrax populations sampled in the North-East Mediterranean. This is the main area where the hatcheries collect their broodstock candidates from the wild in Turkey, second biggest sea bass producer in Europe after Greece. Seven samples were finally studied at 10 microsatellite loci using a multiplex PCR, five collected from the Turkish Levantine and Aegean Sea coasts, in addition of one Atlantic and one Adriatic samples (Total 305 individuals). All samples were sequenced on ABI 3730xl in HCMR.....