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  • 1
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    Impact of drainage water inflow on the environmental conditions and fishery resources of lake borollus (2007)
    National Institute of Oceanography and Fisheries, Egypt
    Details
    Publication Date: 2021-05-19
    Description: The brackish water lake Borollus occupies a central position at the north between the two branches of the Nile delta. This lake has a particular importance in the fish economy of Egypt. Therefore environmental and fisheries investigation was carried out at the lake during 2000–2002, where 15 stations covering the whole area of the lake were sampled. The present study points out that: 1. The water transparency of the lake is low where the average Secchi disc depth ranged between 21.14 cm and 43.89 cm. 2. The average water temperature attained its minimum in winter and ranged between 16.20 °C and 17.80 °C. The highest temperature was in summer where it ranged between 28.33 °C and 28.52 °C. 3. The recorded pH values indicate that the lake water was generally in the slightly alkaline side and optimum for fish to live in. 4. The eastern part of the lake exhibited higher chlorosity values comparing with the middle or western areas as a result of mixing with the penetrated sea water. 5. The whole water body of the lake is well oxygenated where the average values of dissolved oxygen ranged between 6.6 mg/L and 11.1 mg/L. 6. The most abundant species among the inorganic nitrogen compounds was the nitrates. The average concentrations of nitrates in the water of the lake ranged between 1.23 μ gat/L and 7.165 μ gat/L. 7. The isolines distribution of phosphates concentrations indicate that such concentrations were high at the south decreasing northwards. 8. The drainage water contributes in increasing silicates concentrations in the lake water. 9. The sharp decrease in chlorosity of the lake water during the last 30 years greatly contributed in changing the species composition of fish population in the lake. 10. The percentage weight of marine fish species in the experimental catch decreased from 15.99% in 1973 to 1.81% in 2002, where the most of marine fish species did not exist in the catch. 11. The percentage weight of Oreochromis niloticus increased from 19.70% in 1973 to 39.43% in 2002.
    Description: National Institute of Oceanography and Fisheries (NIOF), Egypt
    Description: The Egyptian Journal of Aquatic Research is abstracted in both of Zoological Record and Chemical Abstract since Volume 31(1), 2005. The Chief Editor: Prof. Fatma Aly Abd El-Razek E-mail: fatma_abdelrazek@hotmail.com
    Description: Published
    Description: Water chemistry
    Keywords: Field Study ; Drainage water ; Brackishwater environment ; Fishery resources ; Drainage water
    Repository Name: AquaDocs
    Type: Journal Contribution
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  • 2
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    Effect of ecological and biological factors on the uptake and concentration of trace elements by aquatic organisms at Edku lake (2006)
    Details
    Publication Date: 2021-05-19
    Description: This journal is published by NIOF, Alexandria, Egypt
    Description: The effect of temperature, pH and trace elements concentration in the ambient water on the uptake and accumulation of Cu, Zn, Ni and Pb in various organs of fish and parts of aquatic plants of Edku Lake were studied. It was found that higher water temperature and lower pH during summer increased the rates of trace metals uptake by the most common fish species Oreochromis niloticus. The concentrations of Cu, Zn, and Ni in the various organs of fish were affected by the concentrations of these elements in the water. Cu, Zn, Ni and Pb attained higher concentrations in the roots of Eichormia crassipes if compared with their concentrations in the other parts of this aquatic plant. Sex of fish can be considered as an important factor affecting the accumulation of trace elements in different organs of fish. The accumulation of Cu, Zn, and Ni in the flesh, liver, gonads and bones of fish were negatively correlated with length of the fish.
    Description: NIOF
    Description: Published
    Keywords: Trace elements ; Fish ; Aquatic plants ; Pollution ; Lake fisheries ; Lakes ; Environment ; Accumulation ; Environments ; Lake fisheries ; Lakes
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
    Format: 400823 bytes
    Format: 43326 bytes
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  • 3
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    Impacts of drainage water discharge on the water chemistry of Lake Edku (2007)
    Details
    Publication Date: 2021-05-19
    Description: Lake Edku which is considered as important fishing area in Egypt receives its water from two sources. The main source is the drainage water of Kom Belag and Bersik drains where it is annually supplied with 1836.55 × 106 m3 of water. The sea water of Abu Qir Bay enters the lake sometimes through the lake sea connection as subsurface water current under the action of wind specially in winter. The present study pointed out that the water temperature of the lake (22.38oC) was slightly higher than that of the drains average (21.70oC). The average values of total dissolved solids were 1.88 and 1.44 g/L in the lake and drainage water respectively. pH values indicated that both the lake and drainage water were always on the alkaline side where the average values 8.04 and 7.89 in both respectively. The study showed that the lake and drainage water were mostly well oxygenated therefore nitrate compounds dominated the nitrogen species in the water of both. The annual supply of inorganic nitrogen and phosphorus compounds to the lake through drainage water were estimated as 1065.62 metric tons of nitrogen and 646.61 metric tons of phosphorus.
    Description: تحصل بحيرة ادكو مثلها في ذلك مثل بحيرات مصر الشمالية علي مخزونها من المياه من مصدر رئيسي الا وهو المصارف التي تلتقي بها وتصب اليها مياه الصرف الزراعي الناتج عن المناطق المنزرعة من حولها ، اضافة لذلك تتبادل بحيرة ادكو بعض الماء مع مياه خليج أبي قير من خلال بوغاز المعدية. ويصل الي بحيرة ادكو من مياه المصارف ما يقدر بنحو 1.738 مليار متر مكعب سنويا من خلال مصرف كوم بلاج الذي يصب مياهه في الجزء الشرقي من البحيرة ومصرف برسيق الذي يتصل بالبحيرة في الجزء الجنوبي منها. هذا القدر الهائل من المياه الذي يصل الي البحيرة سنويا لابد وان يكون له أثرا علي الخواص الكيميائية لمخزون البحيرة من المياه حيث يعتبر هذا المخزون وسطا مائيا لمنظومة متوازنة تتضمن من بين ما تتضمنه النباتات والاسماك والاحياء البحرية الاخري وهو ما يتوفر في حالة مياه المصارف. من ثم كان البحث الحالي الذي يتناول دراسة للتركيب الكيميائي لمياه كل من مصرفي برسيق وبحيرة ادكو حيث تم جمع عينات من المياه من 10 مواقع تمثل المساحة الكلية لبحيرة ادكو وعشرة مواقع اخري تعكس الخواص الكيميائية للاجزاء المختلفة من مصرفي برسيق وكوم بلاج وذلك في فصول السنة المختلفة. تتضمن الدراسة تسجيلا لاعماق المياه ودرجة الحرارة والشفافية والرقم الايدروجيني في مواقع جمع العينات ، كما تتضمن تعيين كل من الاوكسجين الذائب ، الملوحة ، تركيزات أملاح النيتروجين الغير عضوي والفوسفات والسيليكات في المواقع المذكورة. وأمكن من خلال هذه الدراسة استنتاج ما بلي:- 1.بالنظر الي انخفاض أعماق المياه في بحيرة ادكو ( لا يتعدي متوسط الأعماق متر واحد) ازداد تأثيرها بحرارة الهواء مقارنة بمياة المصارف الأكثر عمقا. من ثم أظهرت مياه البحيرة ارتفاعا طفيفا في درجة الحرارة عن مياه المصارف. 2.بلغت مياه البحيرة أدني قيمة لها خلال موسم الربيع نتيجة لازدهار الهائمات النباتية في اجزاء البحيرة المختلفة خلال هذا الموسم. 3.تلعب مياه المصارف دورا في خفض ملوحة المياه في البحيرة حيث وجد ان متوسط ملوحة المياه في البحيرة 1.88 جم / لتر ، بينما وجد ان هذا المتوسط 1.44 جم / لتر في مياه المصارف. 4.تباين الوسط المائي في كل من البحيرة والمصارف يميل الي الوسط القاعدي بشكل طفيف حيث ان الرقم الأيدروجيني لمياه البحيرة 8.04 بينما كان 7.89 في مياه المصارف وذلك كقيم متوسطة علي مدار العام. 5.تراوح تركيز الأكسجين الذائب في مياه البحيرة بين 5.44 ، 14.07 مجم / لتر بمتوسط 8.34 مجم / لتر ، في حين تراوح هذا التركيز بين 4.29 مجم / لتر ، 9.60 مجم / لتر في مياه المصارف بمتوسط 6.70 مجم / لتر حيث يستهلك جزء من الأوكسجين في اكسدة المواد العضوية في مياه المصارف. 6.تعد مياه المصارف بحيرة ادكو بأملاح النيتروجين والفسفور بمعدلات عالية سنويا أمكن تقديرها بنحو 1065.62 طن من أملاح النيتروجين غير العضوي ، 646.61 من أملاح الفوسفور ، ويعمل هذا الامداد بالاملاح الغذائية علي ازدهار العوالق النباتية ومن ثم تنشيط السلسة الغذائية بالبحيرة.
    Description: The Chief Editor: Prof. Fatma Aly Abd El-Razek E-mail: fatma_abdelrazek@hotmail.com
    Description: Published
    Description: Water chemistry, Ecology of lakes
    Keywords: Environmental Studies ; Drainage water ; Drainage water
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
    Format: 222536 bytes
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  • 4
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    Ecological and fisheries development of Lake Manzalah (Egypt): hydrography and chemistry of Lake Manzalah (2006)
    Alexandria: National Institute of Oceanography and Fisheries
    Details
    Publication Date: 2021-05-19
    Description: This journal is published by the NIOF, Egypt
    Description: Lake Manzalah; the largest delta Lake in Egypt represents a dynamic system that has been undergoing continuous and pronounced changes since long times. In the last year’s this Lake faced drastic problems that retarded its environmental and fisheries development; the most serious one is the discharge of waste water. It is attempted in the present study to investigate the chemical characters of Lake Manzalah water during 2001-2002. Water temperature ranged from an average of 12.35oC in January and 29.14oC in July. Dissolved Oxygen, pH and total dissolved solids were found in ranges optimum for the living of marine and freshwater fish species. The average concentrations of nutrients lied in the following ranges: 1.24 to 4.89 μmol PO4 -3 l-1 , 5.08 to 28.73 μmol SiO4 -2 l-1 and 1.81 to 17.7 μ_mol NO3-1 l-1 The concentrations of phosphorus and nitrogen compounds were found to be relatively higher at the southern regions of the Lake near to the outlets of the drains.
    Description: NIOF
    Description: Published
    Keywords: Hydrography ; Water ; Chemistry ; Chemical composition ; Water content ; Environment ; Chemical composition ; Environments ; Water content ; Fisheries
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
    Format: 1623488 bytes
    Format: 46916 bytes
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