The main objective of the research was studying the impact of lake development and wastewater treatment projects on the area and production of northern lakes and their contribution to fish production and measuring the fishing effort and the extent of its occurrence or not in these lakes. The study was based on secondary data secured from different sources during the study period (2005 – 2020). The results of the research showed that: Burullus and Manzala lakes are the highest in the fish production of the Northern lakes. Increasing the average production of the northern lakes from 113 thousand tons in the first period to 160 thousand tons in the third period, accompanied by an increase in its contribution to production from natural sources  from 30% to 42.2%. However, the contribution of the northern lakes decreased from 10.7% of the total fish production in the first period to only 8.4% in the third period. The study also showed the positive impact of the lakes development project in comparison to the variables between 2016 and 2020, and it was found that those lakes were not exposed to overfishing as an average for the study period, with the exception of Lakes Mariout and Idku in the third period. Therefore, it is necessary to raise the efficiency of the management of these lakes, and to include in development plans complete packages of purification, dredging, opening the sockets, and stopping the dumping of untreated sewage.