A survey has been done and a detailed account has been given of the impact of physicochemical parameters of water on the biodiversity of monogenean parasites in Clarias gariepinus Burchell, 1822 from degraded aquatic ecosystems located in the Nile Delta, north Egypt between summer (2021) and spring (2022). The thermal regime of the investigated habitats is close to one another. Surface water temperature ranged between 24.00 and 25.13°C. The depth of water in the investigated habitats ranged between 0.672m and 1.60m. Transparency of water fluctuated between 27.5 and 45.00cm. All explored habitats are classified on the alkaline scale (pH: 8.69- 9.09). The electrical conductivity (EC) scored 0.48-0.77 μmhos/cm, whereas total dissolved solids recorded 305.59-494.40 mg/L. The water body of MAS-1 was more oxygenated than other habitats. Oxygen dissolved in water ranged between 5.33 and 7.18 mg/L. Water sampled from Amlak Drain stored the greatest quantities of HCO3‒ and SO4‒2 (45.63±13.95 mg/L and 72.58±12.39 mg/L, respectively). Mean chlorides in water from Amlak Drain, Nezam Drain, MAS-1 and MAS-2 were 376.20±26.02, 346.00± 57.75, 248.52±158.70 and 318.77±79.91 mg/L, respectively. Surface water from all explored habitats contained significant quantities of nitrogen, but scanty quantities of phosphorus. The greatest quantities of Ca++, Mg++ and Na+ were measured at Amlak Drain (23.48±4.39, 12.72±2.72 and 450.80±25.571 mg/L, respectively). The highest amount of K+ was recorded at MAS-1 habitat (7.88±2.29 mg/L). With a few exceptions, Fe, Al, Cu, Hg, Zn, Cr, Cd, Pb, Ni and Co in water exceeded the guideline limits of WHO. All explored habitats included poor water quality (CCME WQI= 0-44). The relationship between water features and possible impacts of pollutants on human health and ecosystem equilibrium are discussed in detail.
Gadalla, M. H., El-Naggar, A. M., Alraesi, A. M., & El-Bahnasy, H. T. (2025). Influence of Physicochemical Factors and Heavy Metals on Water Quality Index in Fragile Aquatic Habitats at Nile Delta, Egypt. Mansoura Journal of Biology, 72(1), 6-19. doi: 10.21608/mjb.2025.442706
MLA
Mohamed H. Gadalla; Ahmed M. El-Naggar; Ahmed M. Alraesi; Hanaa T. El-Bahnasy. "Influence of Physicochemical Factors and Heavy Metals on Water Quality Index in Fragile Aquatic Habitats at Nile Delta, Egypt", Mansoura Journal of Biology, 72, 1, 2025, 6-19. doi: 10.21608/mjb.2025.442706
HARVARD
Gadalla, M. H., El-Naggar, A. M., Alraesi, A. M., El-Bahnasy, H. T. (2025). 'Influence of Physicochemical Factors and Heavy Metals on Water Quality Index in Fragile Aquatic Habitats at Nile Delta, Egypt', Mansoura Journal of Biology, 72(1), pp. 6-19. doi: 10.21608/mjb.2025.442706
VANCOUVER
Gadalla, M. H., El-Naggar, A. M., Alraesi, A. M., El-Bahnasy, H. T. Influence of Physicochemical Factors and Heavy Metals on Water Quality Index in Fragile Aquatic Habitats at Nile Delta, Egypt. Mansoura Journal of Biology, 2025; 72(1): 6-19. doi: 10.21608/mjb.2025.442706
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