Prof. Tarek G. Ismail

Professor - Professor

Faculty of science

Address: Zoology Department - Faculty Of Science - Sohag University


A new species of parasitic water mite, Unionicola aegyptiaca (Acari: Unionicolidae) collected from Freshwater Mussel, Sohag, Egypt.
_ Unionicola aegyptiaca_ was described for the first time from the freshwater mussel,_ Caelatura__aegyptiaca,_ River Nile, Sohag, Egypt. The descriptive characters of the present species are in accordance with those of the superfamily, family and the genus. The present species has a specific characters compared with characters of other species of the same genus. These characters are summarized as follows: ... Read more

Pathogenic bacteria carried by synanthropic filthy flies (Musca species) at farmed animals in Sohag Governorate, Egypt 2-Percentage of bacterial infection in Musca species.
Although flies are important vectors of bacterial pathogens, there is little information to assess the health risk of the presence of individual flies especially at animal barns in Sohag Governorate. This study determines the prevalence and the risk of bacterial pathogens associated with the body surfaces of individual wild flies at three different animal barns. A total of 148 caught ... Read more

Histopathological study on a freshwater mussel, Caelatura aegyptiaca, infected by a haplosporidian parasite.
In the present study, a haplosporidian parasite was detected in the freshwater mussel _Caelatura aegyptiaca_. This mussel was collected from a site located on the eastern bank of the River Nile about 21Km north of Sohag city. The haplosporidian parasite was found to inhabit different organs of the host such as gills, mantle and foot. Their epithelial and connective tissues ... Read more

Effects of visual and chemical cues on orientation behaviour of the Red Sea hermit crab Clibanarius signatus.
Directional orientation of Clibanarius signatus toward different targets of gastropod shells was studied in a circular arena upon exposure to background seawater, calcium concentrations and predatory odor. Directional orientation was absent when crabs were presented with the white background alone. Each shell was tested in different positions (e.g., anterior, posterior, upside-down, lateral). Adult crabs were tested without their gastropod shells, ... Read more

Effects of competitive ability and shell resource value on the outcome of fighting contests of the Red Sea hermit crab, Calcinus latens.
The influence of shell status (size, quality and preferred type) on fighting behavior of the hermit crab Cal_cinus latens _was examined. In the present species, the motivation to acquire a new shell is influenced by the value of its own shell rather than that of the rivals. The results suggest that crabs in suboptimal shells were more prone to initiate ... Read more