Speakers - 2025

Biography

Prof. Sayed-Ahmed was awarded his Ph.D. in cancer gene therapy from TIHO, Hanover, Germany. He is working as a professor at the Department of Infectious Diseases, College of Veterinary Medicine, Mansoura, Egypt. He works at the Department of Clinical Practice, College of Pharmacy, Jazan University, Saudi Arabia. He is an editorial board member, a peer reviewer of several international journals, and a guest editor at the Experimental Pharmacology & Drug Discovery section of Frontiers in Pharmacology. He is a strong research professional with a Doctor of Philosophy in Cancer Biology, Immuno-oncology, and Molecular Biology. He was a director for (4) research projects funded by the Research Development and Innovation Authority (RDIA), Ministry of Education in Saudi Arabia, and CO-PI of (1) research project funded by the Deanship of Graduate Studies and Scientific Research, Jazan University, Saudi Arabia.

Abstract

Manzala Lake was sampled to assess the concentrations and possible ecological risks of heavy metals. The mean heavy metal levels in the muscles of Nile tilapia, Flathead grey mullets, and African catfish were 0.01, 0.15, and 0.29 mg/kg, respectively, for mercury; 3.16, 4.25, and 4.74 mg/kg for arsenic; 1.01, 0.87, and 0.95 mg/kg for lead; and 0.05, 0.12, and 0.06 mg/kg for cadmium. The levels of heavy metals exceeded their maximum permissible limits in most samples. The EDIs of some metals were higher than their PTDIs or BMDLs. The THQs and TTHQs from metal intake were >1 for Hg and Cd. In addition, the TCR values of As in all fish species were higher than 1.0 × 10−4,, indicating potential health risks from consumption of fish species,, which need strict hygienic procedures to prevent fish contamination with heavy metals and ensure that their levels did not exceed the maximum permissible limits.

Keywords: Heavy metals, Fishes, Risk assessment, cleaning, Dredging, Manzala Lake