This research aimed mainly to develop an extension Plan for the management of Lake Nasser's fisheries. Field data were collected through a personal interview questionnaire in January and February 2023, for a simple random sample of 48 respondents representing 87.3 % of the total of 55 Respondents. Frequencies, percentages, relative weight, and a surplus production model, "Schaefer", were used for data presentation and analysis. The results revealed that:
According to respondents, the main dimensions in fisheries management were ranked in the following order: Biological (91%), Administrative (90.4%), Economic (90.1), Social (89%), and Ecological (87.7%). The most important problems related to fisheries management from respondents point of view, expressed in relative weight, were: overfishing, illegal fishing, and environmentally harmful practices (96%), Enforcement of existing laws (92%), And the weakness of Extension, training, and public awareness services (81%). The Schaefer surplus production model applied from 2010 to 2021 estimated a Maximum Sustainable Yield (MSY) of approximately 27089 tons per year, from fishing effort equal to about 4114 boats and the actual production exceeded the allowed production quantity (MSY). This may due to potential overexploitation, mainly through illegal and unauthorized fishing. An Extension plan for fisheries management at Lake Nasser was proposed using Pressure-State-Response (PSR) model. Respondents' recommendations for fisheries recovery included strengthening law enforcement (64.6%), Continuing Prohibiting of Fishing during Spawning season (58.3%), and prohibiting fishing in overexploited areas, reducing the number of fishing boats and regulating their specifications (54.2%), and imposing restrictions on fishing nets, particularly length and mesh size (50.0%).