Fishing is a traditional economic activity in all Mediterranean countries, including Croatia. Furthermore, fishing is one of the most important activities in the coastal zone of Croatia, but in the last few decades there have been reduced amounts of fish resources in the Adriatic Sea.Given the extensive knowledge of marine environment fisherman can significantly contribute to creation od sustainable fisheries in our country and beyond.Local ekological knowledge about fisheries (FLEK- Fisheries local ekological knowledge) can help to complete information related to the marine environment and marine organisms, especially in situations where scientific dana are scarce.For this reason, the term FLEK-Fisheries local ecological knowledge has recently been introduced. This paper investigates the knowledge of local fishermen about fishing tools, vessels and the occurrence of invasive species in the coastal and island part of Zadar county. The aim of this paper was to collect as much information as possible about ecological and ichthyological knowledge of the populations of various fish species and other marine organisms and the occurrence of invasive species in the aforementioned area. The research part of this work was carried out within fishermen surveys, mainly on the fish catch considering species leveland overall quantity, fishing tools and equipment used from the 1950s untillthe present day. The purpose of this study was to evaluate whether there are qualitative and quantitative change in the captured marine species, and to collect data on the occurrence of invasive species over the last five decades. According to the results of this research, it can be concluded that the most used fisihng tools are: longline and fish-hooks within the coastal part, while different type of fishing nets were more frequent in the island part of the Zadar county.Respondents from the island part mostly use larger fishing boats with a stronger engine while in the coastal part respondents more often use smaller motor boats.Fishspecies caught that today are significantly fewer compared to the same fish species hunted in previous decades, both, in the coastal and island part of the Zadar county. The highest expense to fishermens is fuel, and most fishermen would increase supervision for bottom trawlingand shore seine net.0