4 research outputs found
Vertical distribution of zooplankton in Lake Nasser
No full textThe composition and distribution of zooplankton communities in three depths (surface, 10–5 m and 20–15 m depths) along main channel of Lake Nasser were studied in 2013. The density of total zooplankton was increased to maximum during winter and autumn at surface water (39,362 and 63,100 Ind. m−3, respectively) and gradually decreased with depth until attaining the lowest average density at 20–15 m (12,460 and 8976 Ind. m−3). During spring and summer, zooplankton was irregularly distributed through the water profile, where the highest average density was recorded at 10–5 m depth (66,007 and 66,734 Ind. m−3). Copepoda was the dominant zooplankton group at all depths, it represented about 70–76.2% of the total zooplankton count. Cladocera formed about 13.4%, 14.5% and 11% of total zooplankton density for surface, 10–5 m and 20–15 m depth. It was decreased with increasing depth during winter and autumn; however it attained its maximum density at 10–5 m depth during spring and summer. Rotifera average density decreased with increasing depth. The dominant zooplankton species inhabiting Lake Nasser were strongly temperature-dependent. The study recommends the introduction of some pelagic fish species to consume the high persistence of zooplankton community at the upper 10 meters of water column
Physico-chemical conditions and macroinvertebrate fauna in the River Nile from Aswan to Cairo
No full textImproved fisheries productivity and management in tropical reservoirs
No full textThe objective of the project was to contribute to the current research on reservoirs enhancement fisheries in tropical countries through the implementation of a series of action-research activities implemented in two small reservoirs in the Indo-Gangetic basin in India, and two very large reservoirs in Africa, the Lake Nasser (Egypt), and the Volta Lake (Ghana). Socio-institutional analyses were also conducted in these reservoirs to improve our knowledge regarding some of the main social processes that influence reservoir productivity. Overall the results of the project stress that while the natural biophysical constraints of the reservoirs are important in defining the ecological production processes, it is the socio-economic settings characterizing the community/societies around the reservoirs that eventually shape the human production enhancement possibilities.Reservoir fisheries, Inland fisheries, Sociological aspects, Socioeconomic aspects, Africa, Nasser L., Ghana, Volta L.,
