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A study to reduce the impacts of Assiut barrage on Nile river fish production

Salwa M. Abou El Ella[1] ; Mahmoud Samy Abdelsalam[2] and Amany Saad Aly[3]

[1]- Channel Maintenance Research Institute, National Water Research Center, Delta, Barrage,

P.O. Box 13621, Egypt. E-mail: [email protected].

2-Irrigation and Hydraulics Department, Faculty of Engineering, Ain Shams Univ., Cairo

3-Development & Protection of the Nile River Sector, Ministry of Water Resources & Irrigation

ABSTRACT

The river environment with its structural and hydraulic features creates habitats for aquatic life of which fishes are the most notable. The up stream and down stream fish migrations are ecological imperatives for fish life cycle. The Egyptian government has established a series of dams and hydropower stations which are urgently needed due to rapidly growing population. However , these control structures with its hydropower generation stations not only create a barrier for fish life cycle, but also they can induce mortality to fish by passage through turbines. Fish passage facilities are hydraulic structures designed to assist upstream migrating fish to restore their life cycle and for safely transition downstream of turbines.

This study investigated the negative impacts of Assiut barrage as water control structures on productivity of Nile tilapia at the governorates which located downstream the barrage. In order to restore Nile River fish production in Assiut barrage, it is recommended to design an efficient fish passage system in the form of pool and weir fish way but with using an orifice at the bottom of the weir to accommodate the weak leaping ability of Tilapia fish. 

Key words: Water control structure, hydropower station, fish migration, fish life cycle, fish  passage system.