Problems such as economic losses due to fish diseases and infections, are the most important issue for the development of the fisheries sector. Current studies focus on the use of immu-nostimulants against fish diseases due to the fact that there is still no effective treatment for a few fish diaseases and the available treatments possess additional stres for fish. In this review, the advantages and disadvantages of the immunostimulants used against fish disases and stud-ies on the current immunostimulants are summarized.
