Abstract: The fertilizer use, N and P concentrations, fish landing, and its ecological effects  were summarized in the delta lagoons and the sea in Egypt. In 1964, Aswan High Dam was completed and followed by the drastic declining in the fish landing of Egypt. Afterwards, a great amount of fertilizer use promoted the nutrients input including N, P into the four lagoons and adjacent sea, leading to the miraculous recovery of fish industry. In addition, some P-limitation scenarios can be observed in the adjacent sea due to the over input of P fertilization. At last, some suggestions on the nutrients research of Yangtze delta were forwarded considering the Three-Gorges Dam impoundment and its possible impact on the Yangtze estuarine