Fishing is an economic activity with long tradition in the Mediterranean area. Despite the changes it is considered important in coastal countries, including Croatia. Over time, the development of technologies follows the development of fisheries and changes are consequently visible in the marine environment. Thanks to the spread of knowledge about the biodiversity, fishers are getting acquainted with the sustainable fishing and it begins to be implemented. Fisheries local ecological knowledge (FLEK) enables the acquisition on new knowledge of marine resources and the observation of important problems in fishing and dealing with the causes. This work aims to collect data on fisheries local ecological knowledge in area of island Dugi otok as type of fishing tools, new invasive species, reduction of fish stocks etc. Data was collected by conducting a survey with local fishers of different age groups, for different periods of time and for those using different fishing techniques. The aim of the research was to obtain information on the dynamics of fishing over the years and on the state of fish stocks in the mentioned area. By analyzing the survey, we found out that the majority of the island's population owns smaller boats, and they mostly use single and triple nets, longlines and traps as fishing gear. Different type of trawls were used more in the past. Today's catches are generally smaller than they were in the past, as are the target species whose size decreased over time, while some fish species have become rare or completely disappeared from the catch. Fuel prices and maintenance of tools and vessels pose major problems for fishermen. Most fishermen believe that in order to achieve sustainable fishing, it is necessary to increase controls over tools and catches and to reorganize bans on the use of fishing tools.