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Vol.4 No.1 – 4 : Impact of environmental pollutants and parasites on the ultrastructure of the Nile bolti, Oreochromis auruis

By :Eman Hashem Radwan , Amel Abd El Rahman Hassan  , Gehan Hassan Fahmy, Salma Sameh El Shewemi and Sherine Abdel Salam

 

Abstract

Environmental variability has great impact on processes of ecological organization. Local variation probably accounts within population variation in death rate. Marine parasites are of great importance. Incorporating environmental variation into theories of life histories for a better understanding of how environmental factors influence physiology, and the resulting histories of individuals. Adult Oreochromis auruis were collected from, El Behiara, Egypt. Concentration of Pb, Cu and Cd have been detected in the biota samples collected from El Behara, Egypt. The plenty of heavy metal concentration in the fish samples was found in the order Cu > Pb > Cd. A significant correlation (p<0.05) were found for each of Cu, Cd and Pb in Oreochromis auruis . The mean level of Pb is highly positively correlated with mean concentration level of the activity of GPx and the mean level of the total protein as r= 0.51 and r= 0.61; while Cu is highly positively correlated with Cd, S‰ and the total protein as r=0.75, r=0.65 and r=0.74; respectively. Cd is only highly significantly correlated with the total protein as r= 0.64.The salinity was highly correlated with both pH and the total protein as r=-0.64 and r=0.6; respectively. The mean value of pH is highly negatively correlated with both GPx and with the total protein as r= – 0.50 and r=-0.52; respectively. The activity of GPx is highly correlated with only the activity of the SOD as r=- 0.701.


(final2) salma, shirin, eman, gehan,amal.docx,2018.docx7-4-2018 (1)

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Vol.2 No.6 -6 : Survey on the parasites infested crayfish Procambarus clarkii, Girard,1852 (Crustacea, Cambaridae) in Egypt.

By : Shimaa M. Abd El-Moaty, Hesham M. Sharaf, Abd El-Monem M.Khalil and Shimaa S. Ahmed.

Abstract

A parasitological survey on 1474 fresh water crayfish Procambarus clarkii was carried out during the period from January 2013 till May 2014 from different canals at Sharkia, Dakahlia and Kafr El-Sheikh Provinces in Egypt. Out of the examined crayfish , 8 were found to be infected with ectoparasitic protozoan Epistylis cambari on the gill filaments with percentage of infection 0.54% . Infection rates were varied between investigated areas, the percentages of infection were 0.21%, 0.57% and 2.7% at Sharkia, Dakahlia and Kafr El- Sheikh provinces respectively. Regarding to the seasonal prevalence of Epistylis cambari in examined crayfishes the peak of infection at Sharkia Province was recorded in summer (3.5%) , while at Dakahlia and Kafr El- Sheikh Provinces was detected in spring (1.13%) and (5.12%) respectively. The present study revealed that 11 out of 1474 (0.88%) were infected by one or more parasitic nematode larvae Strongyloides stercoralis that were observed in hemoceol of crayfish .The percentages of infection were 0.31%, 2.3% and 1.3% at Sharkia, Dakahlia and Kafr El-Sheikh Provinces respectively. Concerning to the seasonal prevalence of nematode larvae in examined crayfish, the peak of infection at Sharkia Province was detected in spring (4.5 %) ,while at Dakahlia Province was in summer (3.2%) and at Kafr El-Sheikh Province was in spring (1.5%). No infection was detected in winter and autumn.


6. Survey on the parasites infested crayfish Procambarus clarkii, Girard,1852 (Crustacea, Cambaridae) in Egypt.
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