Abstract

Prevalence of Monogenean Trematodes of Tilapia species from River Nile in Beheira Province, Egypt

Authors: Mohamed Khallaf, Layla O Elmajdoub, Abeer Awad, Amanallah El-Bahrawy, Ahmed Elkhatam, Mosaab A. Omar and Shimaa sobhy sorour

DOI: http://dx.doi.org/10.71081/cvj/2022.008

Abstract
The objective of this study was to investigate the prevalence of Monogenean Ectoparasites in Tilapia species from the Nile region in Beheira Province, Egypt. This study was carried out from January to December 2019 at two different localities of Beheira governorate to determine the prevalence of Cichlidogyrus spp. and Gyrodactylus spp. in Tilapia fish and their histopathological effects. Of the 870 examined Tilapia fishes, 83 (9.54%) were infested with Cichlidogyrus spp. and 13 (1.49%) were infested with Gyrodactylus spp. The Cichlidogyrus spp. had the highest infestation rate with a significant difference in all seasons. According to the Tilapia weighing, there were no significant differences between the weight of fish and infestation rates. Concerning the Tilapia species, the infestation rate with Cichlidogyrus spp. was recorded to be the highest in T. zillii (26.4%), whereas the infestation rate with Gyrodactylus spp. was similar in all Tilapia species. The affected gills manifested thickening and necrotic changes by histopathological examination. The parasites reported may affect the health and quality of fish leading to condemnation at inspection.

Keywords: Ectoparasites, Freshwater fishes, Monogeneans, Prevalence & histopathological effects