Effect of Environmental Pollution on Gonads Histology of the Nile Tilapia, Oreochromis niloticus from Lake Manzala, Egypt

Histopathology and Ultrastructure in Liver and Gonads of the Nile Tilapia (Oreochromis niloticus) as a Bio-Monitor for Water Quality Assessment in Lake Manzalah

“…Fish population dynamics are significantly influenced by the gonad anatomy (Pope et al, 2010). One of the numerous environmental conditions that might lead to a seriously harmed fish reproductive system is the presence of contaminants (Mansour et al, 2018). According to the current study, the environmental effects of Lake Manzalah led to a noticeable decline in the gonad activity of the fish that were the subject of the study.…”

Heavy metals and parasitological infection associated with oxidative stress and histopathological alteration in the Clarias gariepinus

“…The presence of pollutants and heavy metals is one of many environmental factors that can result in a dangerously affected catfish reproduction system (Authman et al 2015). Mansour et al (2018) reported that the environmental impacts of pollution caused a pronounced decline in the gonad activity of the studied fish, which was reflected clearly by decreasing sperm in ripe testes and ripe oocyte degeneration (atresia). In the present research, the results of histological examination of gonads proved that pollution disrupted the gonadal development, especially in the twoseason (autumn and winter) and area B.…”

Correlation between Polyaromatic Hydrocarbons (PAHs) Discharges at El-Manzala Wetland with the Relative Gene Expression of CYP19 Gene of the Nile Tilapia (Oreochromis. niloticus)

“…CYP family genes show a critical role in the immersion of the PAH. Also, the acceptance of the development of the fish CYP gene and its association with the metabolism of PAHs is important for the valuation and prediction of the ability of fish to acclimatize to xenobiotic risk (Moses et al, 1993), and it is induced by a broad range of xenobiotics such as PAHs (Mansour et al, 2018). PAHs are lethal substances to gonads as they can induce significant alterations in gene expression patterns.…”