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Environmental problems in shipping belong to the most important research topics in the marine sector, where a number of technical and operational measures to improve environmental friendliness of ships can be found in the literature. Most of the fishing vessels are powered by diesel engines and alternative fuels or full electrification of the ship power system as the ultimate game changer are regularly considered in the literature as technical measures that offer both environmental and economic benefits. It is clear that emerging of alternative powering options is affected by the relevant infrastructure and their availability at the location of use. This paper investigates the availability of alternative energy sources in Croatia and their perspective to improve the environmental friendliness of fishing vessels in the Adriatic Sea. In this sense, trends in prices of diesel fuel, alternative fuels such as for instance hydrogen, LNG, biodiesel, as well as renewable energy sources for electricity production are considered. Potential benefits of their use in the fishing sector are quantified based on the energy demand of a typical purse seiner in the Adriatic Sea. [ABSTRACT FROM AUTHOR]