20fi) or inedible algae. Nanoplankton was dominated and represented by about 69,4% of total phytoplankton, while netplankton was about 30.6%. Size fraction ratio was controlled by their relative size-specific growth rates not by herbivorous zooplankton. There was a linear relationship between the relative contribution of nanoplankton and total algal biomass (r=0.96, p>95). Primary productivity has been affected by nanoplankton more than any other biotic variable.Abiotic parameters (physical and chemical) were also studied and discussed in relation to its effect on primary productivity. The statistical analysis cleared that water temperature and NO3-N were the main factors regulating primary productivity among all ecological parameters tested.]]>
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i.exemarkably higher than that reported for marine organisms. Organisms collected opposite to sewage discharge were characterized by high chemical components while opposite to industrial discharge, the zooplankton chemical components were minimum. The chemical composition of zooplankton is mostly affected by the variations of available food represented by chlorophyll a concentrations.]]>
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0.05). The highest values of PER and PPV were obtained with 25% CP at low (1.913 and 30.54%, respectively) and high density (1.720 and 26.64%, respectively) with significant difference (PO.01).Moisture was significantly affected by protein level only (PO.05), while crude protein, total lipids and ash were significantly affected by protein level and stocking density. The highest protein content in fish body was obtained with 45% CP at low and high densities (58.0% and 57.9%, respectively; P>0.05). The highest content of body lipids was observed in fish fed 25% protein diet at low and high densities (32,8 and 31.0%, respectively; P>0.05). The highest content of carcass ash was noticed in fish fed 45% protein diet at low and high densities with significant difference (15.6% and 16.8%, respectively; P<0,05).]]>
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