تاثير تربية الاسماك بالاقفاص الموضوعة في نهر دجلة المار بمدينة بغداد في مجتمع الهائمات القشرية == The Impact of Fish Farming By Cages Placed In The Tigris River At Baghdad City On The Community of Crustacean Zooplankton
Author name:
حارث قاسم مهدي
Supervisor name:
صباح فرج عبد الاحد
General topic:
Biology
Specific topic:
Zoology - Invertebrates
Degree:
Master
University:
University of Baghdad - Ibn Al-Haytham College Of Education For Pure Sciences - Department Of Biology
Language:
Arabic
University location:
Baghdad
First pages:
24T2832 - p.pdf
Abstract:
ان الاثار البيئية لزراعة الاسماك في اقفاص التربية في العراق لم تتم دراستها بصورة جيدة،علما ان هذا النشاط يمارس على نحو متزايد وهناك حاجة كبيرة لدراسة الاثار المترتبة على ذلك.اجريت الدراسة الحالية على مواقع اقفاص تربية الاسماك في نهر دجلة شمال بغداد للتعر | The present study took place on fish farming cages located in the Tigris River in the north Baghdad, to in order to study the effects of high fish densities on zooplankton communies in addition to study of some physical and chemical factors.The environmental effects of fish farming in cages in Iraq have not been studied well, knowing that this activity is practiced increasingly and there was a significant need to study the implications of this important mater.The aim of this study was to investigate the effects of carpfish farming cages on the density of zooplankton in the Tigris River, The samples were taken twiece a month form the three stations for six months from January to June 2014 in three selected stations in the river stream : the first place was Al - Rashidiya station which located in Al - Rashidiya area (Kadhim Al - Ali), 5 km from tourist Baghdad island and the second station was Algriaat 1 which located in Algriaat area in Rusafa side of Baghdad city corresponding to the Kadhimiya near the bridge of riverain pedestrian (Al - Duab bridge) connecting between Al - Rashidiya, while the Al - Kadhimiya and the third station was Algriaat 2 which located in Algria’at zone corresponding to the area of Kadhimiya.The study included the identification studying the density of three grops of zooplankton which were Calanoida, Cyclopoida and Cladocera in addition to the measurement of some physical and chemical characteristics of river water and its effect on the three zooplankton community according to their importance, which included velocity of water current, water temperature electrical Conductivity and Salinity, pH, dissolved oxygen(DO), biological oxygen demand (BOD), phosphate concentration and nitrate concentration. The results of the present study showed that the density of Cladocera. Was lower than the densities of Calanoida & Cyclopida in the three station. on the other hand the current study showed that the densities of both Calanoida and Cyclopoida were oscillatory during the months of th study between highest and lowest, without in statistically significant differences, but the highest densities in June, and this study shows that the highest densities of the three groups of zooplankton were recorded in June. The present study showed a negative effect of the high density of the fish in the cages on the density rate of planktonic crustacea by reducing the numbers and the density of planktonic crustacea community inside cages. Compared with planktonic crustacea community outside the cages and with those within 100 meters far from cages, the differences were statisticaly singnficance.On the other hand regarding to the results of the physical and chemical factors it was found a highest that the velocity of water current rate was 82.50 cm/s in Algria’at 2, while the lowest was 43.33 cm/s in Al - Rashidiya station.Water temperatures ranged between 9C° in Algria’at 2 to 32C° in Al - Rashidiya station during the study period.The highest rate of electrical conductivity was 1032.00 ?S/cm in Algria’at 1, while the lowest was 765.25 ?S/cm in Al - Rashidiya station, while the highest rate of the salinity concentration in the fish cages was 0.66 mg/L in Algria’at 1 and the lowest concentration of salinity was in Al - Rashidiya 0.48 mg/L.pH values ranged between 7.20 in Algria’at 2 to 8.05 in Algria’at 1 in March for both stations, whil the concentration of dissolved Oxygen in water concentration ranged between 5.95 mg/l in Al - Rashidiya to 7.70 in Al - Rashidiya and Algriaat 1. and the Biological Oxygen Demand ranged was between 4.11 mg/l in Algriaat 1 to 6.50 mg/L in Al - Rashidiya station during February for both stations. It was also found that the lowest concentration of phosphate was 0.016 ml/l in Algriaat 2 in april while the highest concentration was 0.075 mg/l algreaat2 in march Also it was found that the lowest cocentration of nitrate 0.82 mg/l was recorded in al griaat 2 in fabruart while the highest conceneation 1.90 mg/l was recorded in Al Rashidya in june.All the results of the physical and chemical factors founded were within normal allowable environmentally boundaries and which have no effect on the aquatic planktonic crustacea community.
