Linking Ecophysiological Alterations and Pesticide Bioaccumulation in Tilapia zillii Inhabiting Wadi El-Rayan Lakes, Egypt | ||
| Egyptian Journal of Aquatic Biology and Fisheries | ||
| Volume 29, Issue 5, September and October 2025, Pages 3177-3199 PDF (988.88 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejabf.2025.429549.6717 | ||
| Authors | ||
| Khalid H. Zaghloul* 1; Kamla Moftah AbdElnaby2; Hossam Shabaan Zayed3 | ||
| 1Zoology Dept. Faculty of Science, Fayoum University, Egypt | ||
| 2Egyptian Environmental Affairs Agency – EEAA , Faculty of Science . Fayoum University | ||
| 3Head of Fayoum Branch, Egyptian Environmental Affairs Agency – EEAA | ||
| Abstract | ||
| Wadi El-Rayan lake system, a Ramsar-designated wetland is one of the most ecologically and economically important freshwater bodies in Fayoum Governorate, Egypt. This study investigated the seasonal and spatial variations in pesticide bioaccumulation and the associated physiological impacts on Tilapia zillii from Wadi El-Rayan lakes, Egypt. Twenty pesticide compounds—including organophosphates, triazoles, carbamates, and pyrethroids—were quantified in fish tissues. Significantly higher concentrations were detected in Lake 1 during winter, with compounds such as terbufos, malathion, and methyl parathion showing notable accumulation. Morphometric traits and relative organ weights indicated severe impairments in growth and organ function, particularly in Lake 2 fish, which exhibited reduced muscle mass along with enlarged gills and livers. The condition factor (K) also varied significantly across lakes and seasons, correlating with levels of contaminant exposure. These findings highlight the ecotoxicological risks posed by agricultural pollutants and emphasize the need for regulatory actions and continuous ecological monitoring. | ||
| Keywords | ||
| Pesticide residues; Wadi El-Rayan lakes; Tilapia zillii; Morphometric alterations; Seasonal variation | ||
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