Fish diseases are a big problem in aquaculture. A large part of the financial resources is being spent on their control and treatment. Vaccines and medications against viral and bacterial diseases are already approved and developed, while parasitic diseases are still trying to be figured out and cured. Unknown details about parasitic life-cycles and their effect on the host are a big obstacle in development of effective and save antiparasitics and the cause of difficulties in farms. The lack of medicines, insufficient biosecurity measures and poor hygiene and husbandry practices can cause devastating consequences in aquaculture. Intensive farming increases fish receptivity to different illnesses and the rate of disease spread which cause increase in mortality, decrease in growth and food intake, increase of expenses for veterinary examination of infected animals and frequent removing of dead individuals as well as the decrease in quality and market value of final product. The aim of this paper is to summarize and present in one place the most common parasitic diseases, their impact and consequences they are causing in cage farmed sea bass and known methods of their treatment, in order to facilitate future management and improve disease control techniques. Since parasites on farmed sea bass are numerous and there are many records about them, in this paper, the most common parasitic diseases of farmed sea bass in the Mediterranean, and especially in the Adriatic, will be reviewed, since there are no detailed records from the Adriatic showing everything in one place. Although technological farming methods are being changed and newer control and disease prevention measures are being used, parasitic diseases are more likely to remain problematic primarily due to increasing human food needs due to population growth and progressive climate change.