Scientist from thirteen laboratories from eight European countries common interest at the improvement of sea bass culture technologies. For the purpose of this concerned action. They have expertise in molecular genetics, population genetics, quantative genetics and husbandry, which are one, or more of the following technologies required to reach the targeted aim. Such as; -How to collect the different populations and evaluate their variability? -How to rear their progenies and store them with a maximum of security and sanitary quality? -How to identify the genetic parameters of the commercial interest traits? -How to compare their performances? According to their significant economic impact, the selected criteria are the followings: -Growth and shape -Fillet quality -Sex ratio and maturation -Disease susceptibility Turkey has favourable ecological conditions for marine aquaculture and also sea bass farming. But all of the marine fish farms in Turkey should be improved their technologies.