The study mainly aims to estimate the investment efficiency of the fishermen of the Al-Jawabi craft in Manzala Lake in El-Gamaleya and El-Matareya districts, Dakahlia Governorate, Egypt. In order to identify the efficiency of investment in the fishing process of the El-Jawabi craft in the lake. The 30 out of 215 and 31 out of 1980 fishermen were selected in El-Gamaleya and El-Matareya districts. So, 61 out of 2195 fishermen were selected as a total from both regions. The results of the study showed that the total amount of Egyptian fish production amounted to about 1.3 million tons in 2010 and rose to its maximum in 2019 about 2.04 million ton, with an annual average of about 1.6 million ton, and an annual growth rate of about 15% during the period (2010-2019). By examining the investment efficiency criteria, it was found that the internal rate of return, benefits/costs ratio, net present wealth, and the speed of capital turnover for the El-Gamaleya district amounted to 75%, LE 1.29, LE 230 thousand, one year and three months, respectively, and for the El-Matareya district it amounted to 68%, LE 1.26, LE 203 thousand, one year and five months, respectively. The study recommends expanding the fishing activity in Manzala Lake, especially in El-Gamaleya and El-Matareya districts, due to the high values ​​of the various indicators of economic efficiency and return on investment.