الفهرس 
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Abstract
This study focused on the validation of the taxonomy, phylogeny and biogeographic
distribution of isopods using two marker genes, nuclear 18S rDNA and mitochondrial
COI. Isopods were collected from seven host fish species, Liza ramada, Solea
aegyptiaca, Tilapia zillii, Pomadasys stridens, Dicentrachus punctatus, Atherinomorous
lacunosus and Nemipterus japonicus at four Egyptian lakes, Lake Qarun, Bitter Lakes,
Lake Burullus, and Lake Manzala; and two marine localities, Red Sea and Suez Gulf,
respectively. The highest prevalence was in Tilapia zillii from Lake Qarun, representing
60% of total collected fishes, while the lowest prevalence was recorded in Solea
aegyptiaca from Lake Qarun (8%). The haplotypes recovered from lake isopods
belonged to Livoneca redmanii, suggesting the biogeographic expansion of this species
among Egyptian distant lake fisheries. A new genus, belonging to the family
Cymothoidae, was recorded in the Red Sea fish A. lacunosus. Elthusa vulgaris was
recorded in the Suez Gulf fish N. japonicus. The present study aimed to develop new
strategic plans for the control of isopods using two model fish (T. zillii and Dicentrachus
labrax). The results revealed that D. labrax can combat and eat isopod parasites in their
territory. Unexpectedly, there was a clear association between isopod infestations and
salinity levels, with the lowest infestation rates occurring in areas with lower salinity.