Maritime traffic as a part of most international trade exchanges directly affects the growth and spread of invasive marine organisms. According to some estimates, as many as 69% of invasive marine organisms are transferred by ships, which is not surprising given that more than 10 billion tonnes of ballast water each year travels around the world in ballast tanks. The increase of international traffic in ports increases the amount of ballast released as well as the intake of organisms. In addition to water ballast, a frequent way of transfer is biofouling. It is considered that invasive species are most responsible for reducing biodiversity on Earth. Invasive species have an impact on human health and the cost of ecological damage is very high. Invasive species control in Europe causes costs of 12.5 billion euros per year, and attention should also be paid to the direct economic impacts of invasive species on human activities such as fisheries, mariculture, etc. The protection of the sea from the transfer of invasive marine organisms becomes an increasing area of interest. Reducing ballast water transfer is possible by various methods that destroy organisms in ballast water, while antifouling coatings try to prevent the organism from sticking to the surface of the ship or destroying it in earlier phases.Prevention is the best method of protection and it is crucial for rapid action and identification when an invasion occurs. Consciousness and education at the local and global level are important segments of the fight against invasive species, and constant monitoring and assessment of the risks and dangers of certain species that have the potential to become invasive are increasingly being implemented. With systematic approach and permanent activities is possible to reduce the number of invasive species, but once they are transferred to a new marine environment, it is very difficult to control them.