Physico -chemical environment of Lake Edku, Egypt

Khalil, Magdy T.; Shakir, Safwat H.; Saad, A. O. M.; Hassan, Montaser M.; Shabrawy, Gamal El

doi:10.21608/ejabf.2008.1997

Cited by 12 publications

(9 citation statements)

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“…Silting of the Boughaz El-Meadia channel is now completely cutting off the lake from marine water, and the Egyptian irrigation law (1984) prohibits the use of Nile River water to supply the lake. The only water supply for the lake is the drainage water received from El-khairy and El-Berzik drains (Khalil et al 2008), which certainly impacts the physicochemical parameters of the water in the lake and in the neighboring fish farms.…”

Section: Discussionmentioning

confidence: 99%

“…Lake Edku is one of the northern coastal lakes in Egypt, located at the western part of the Nile Delta and connected to the Mediterranean Sea through a narrow channel, Boughaz El-Meadia, at the northwestern edge of the lake, which opens into Abu Qir Bay, then to the sea. Nowadays, the main water supply of the lake is the drainage water received from El-khairy and El-Berzik drains, exposing the lake to different sources of pollutants: agriculture drainage loaded with fertilizers, pesticides, and herbicides; untreated industrial wastes of different factories and slaughterhouses; and sewage water (Khalil et al 2008;Badr and Hussein 2010). Excessive eutrophication and frequent episodes of mass mortalities in the lake are often very visible events, and media publicity of them is powerful in developing a perception that our natural lakes are highly degraded through the impact of pollutions and other human insults.…”

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confidence: 99%

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Eutrophication, Ammonia Intoxication, and Infectious Diseases: Interdisciplinary Factors of Mass Mortalities in Cultured Nile Tilapia

et al. 2016

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The present study was designed to assess the possible causes of the mass mortalities of Nile Tilapia Oreochromis niloticus at El-Behera Governorate, Egypt, in relationship to environmental and microbiotic factors. Water samples were collected from fish farms at different locations and from Lake Edku to analyze water temperature, water pH, salinity, biological oxygen demand, dissolved oxygen, total ammonia nitrogen, and un-ionized ammonia. A number of moribund and freshly dead fish were sampled and submitted to our laboratory for microbiological, molecular, and histopathological examination. Water analysis of the fish farms revealed noticeable increases in the previously mentioned physicochemical parameters. Clinical examinations of moribund fish showed severe gill rot and massive external and internal hemorrhages. Ordinary and molecular laboratory findings confirmed the presence of Branchiomyces sp. in gill tissue and mixed bacterial fish pathogens (Streptococcus agalactiae, Vibrio alginolyticus, V. parahaemolyticus, Pseudomonas anguilliseptica, and P. aeruginosa) in visceral organs. The histopathological and transmission electron microscopic examinations revealed severe necrosis of gill filaments and blockage of branchial blood vessels and lamellar capillaries with Branchiomyces sp. hyphae and spores mixed with different shapes of bacteria. Severe inflammations were detected in liver, kidney, heart, and brain tissues. Ultimately, we can conclude that the syndrome of mass fish kills in this area is a consequence of ecological damage to the aquatic environment, which is mainly related to natural and anthropogenic factors, as well as to the presence of infectious agents. Received September 30, 2015; accepted April 12, 2016.

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Section: Discussionmentioning

confidence: 99%

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Eutrophication, Ammonia Intoxication, and Infectious Diseases: Interdisciplinary Factors of Mass Mortalities in Cultured Nile Tilapia

et al. 2016

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“…Edku Lake is one of the northern coastal lakes in Egypt, located at the western part of the Delta Nile (Khalil et al, 2008). It is the third largest wetland area in the northern delta.…”

Section: Study Areamentioning

confidence: 99%

Water Quality and Bacterial Load of Water and Tilapia Organs from Edku Lake

2018

Egyptian Journal for Aquaculture

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Lakes are very important part of the aquatic ecosystem in Egypt. Edku Lake is one of the northern coastal lakes in Egypt which is the third largest wetland area in it. Edku Lake receives huge amounts of drainage water from four main drains, namely, Edku, El Bousily, El Khairy and Bersik which effect on its ecosystem. This study was carried out four seasons of 2017 where twenty-four surface water samples and fish samples were collected from sex stations in the lake. The results of water quality indicated that temperature, pH, dissolved oxygen and phosphorus were indicated in suitable range at all study stations. While, ammonia and nitrite were indicated in stress range for fish, but nitrate results were lied as desirable results. Results of lake water bacterial load (TC& CF) are exceed the permissible values mentioned by EC, 1998 and Ministry of Health, Egypt, 1996. Also, the bacterial loads (Total bacterial count, TC& Coliform group, CF) found in this study for Nile tilapia organs (skin & muscle) was beyond the standard value (FAO, 1979 and ICMSF, 1982), which indicate their unacceptability as food from public health point of view which may be cause human health risk due to consumption of tilapia collected.

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“…These nutritional conditions create rich resource spectrum for algal growth and make the lake biologically productive. Previous studies conducted on the hydrography, chemical and biological characteristics of Lake Edku concluded that this lake suffered from a high level of eutrophication due to the heavy load of nutrients, especially phosphorus [3]. Multi Criteria Analysis (MCA) identifies multiple criteria against which the study area water quality management scenarios can be evaluated and then compared to each other.…”

Section: Introductionmentioning

confidence: 99%

Multi Criteria Framework for Surface Water Quality Management

Hamed¹

2019

JEP

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Edku Lake, the third largest in the system of the northern coastal wetlands in Egypt, situated on the west part of Nile Delta, is considered as an important fishing area in Egypt. The lake suffers from high levels of aquatic vegetation and from the expansion in fish farming and agricultural discharges. To solve lake water quality problems, the study aims to develop the multi-criteria analysis (MCA) framework capable of evaluating the proposed lake water quality improvement scenarios. The work tasks were divided into two phases. In the first phase, many proposed scenarios involved on primary, secondary, surface wetland, biological biofilm, and adding a new artificial inlet were proposed by applying Surface-water Modeling System (SMS) with two dimensional hydrodynamic. The second phase involved in developing the required hierarchical MCA based on an integrated technical, environmental, economic and socio-community indicators. The main results of MCA showed that the water quality management scenario focusing on combination of applying biological biofilm technique for drain effluents and also adding a new artificial inlet at the northern lake region can represent the optimum scenario for solving the lake water quality problems.

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Physico -chemical environment of Lake Edku, Egypt

Cited by 12 publications

References 1 publication

Eutrophication, Ammonia Intoxication, and Infectious Diseases: Interdisciplinary Factors of Mass Mortalities in Cultured Nile Tilapia

Eutrophication, Ammonia Intoxication, and Infectious Diseases: Interdisciplinary Factors of Mass Mortalities in Cultured Nile Tilapia

Water Quality and Bacterial Load of Water and Tilapia Organs from Edku Lake

Multi Criteria Framework for Surface Water Quality Management

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