Author(s): Amr M Helal, Basem S Abdelaty, Mohamed A Elokaby, Mona M Mustafa, Shimaa Hosny and Ahmed MM Heneash

Abstract: Trofic State Index Model (TSI) was used to evaluate the water quality of Al-Nozha Airport Farm Lake. The result revealed that the mean values of water T°C, pH, DO, NH₄, NO2_, NO₃ and PO₄ are in acceptable range. Al-Nozha Airport Farm Lake suffers from high level of ammonia and high blooming phytoplankton. Represented by low transparency value and high level of chlorophll-a. The percentage result of phytoplankton group (cell/l) showed the domination of Cyanophyoceae species followed Chlorophyceae, Bacillariophyta and Dinoflagellet. The dominance percentage of zooplankton is Rotifera, the second common zooplankton group is Cladocera species, followed by Protozoa species Naupllus larvae and Copepoda groups. TSI Model results revealed that Al-Nozha Airport Farm Lake suffers from eutrophication through CTSI. The highest level 93.38 recorded in winter, this mean that eutrophic level is algal scum and few macrophytes this is estimated fish kills summer. The length-weight relationship for L.ramada is an example of commercial species revealed that the b<3 which mean that the growth will be negative allometric. Also the total production of Mullet and Chichlid species decrease to reach the lowest value in 2017, these results may be attributed to water quality which suffers high level of eutrophication and high fry’s mortality. Therefore the present research recommended that must be draining the Airport Farm Lake accompanied by extensive fishing operation.

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