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They were morphologically identified as the Cymothoidae <jats:italic>Livoneca redmanii<\/jats:italic> Leach, 1818 (Crustacea: Isopoda). Obviously, a 23% prevalence rate of isopods was reported in <jats:italic>D. labrax<\/jats:italic> from Egyptian Mediterranean waters. Destructive and degenerative necrotic alterations with complete sloughing of gill lamellae of the infested fish were observed. DNA sequencing of the mitochondrial <jats:italic>COI<\/jats:italic> gene confirmed the identification of the parasite which was deposited in the GenBank under accession numbers MW600099, MZ208984, and MZ208985. Furthermore, the phylogenetic analysis demonstrated that parasites emerged from a monophyletic clade closely affiliated with <jats:italic>L. redmanii<\/jats:italic> and were clearly distinguished from other isopod genospecies.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>The present investigation addresses <jats:italic>L. redmanii<\/jats:italic> infestation in <jats:italic>D. labrax<\/jats:italic> in Egypt and affirmed morphological properties via the scanning electron microscopy (SEM) and molecular characteristics of this isopod species. The drastic effects of this parasite on the infected fish were proven both clinically and histopathologically.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12917-022-03405-2","type":"journal-article","created":{"date-parts":[[2022,8,31]],"date-time":"2022-08-31T12:05:46Z","timestamp":1661947546000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Livoneca redmanii Leach, 1818 (Cymothoidae) a parasitic isopod infesting the gills of the European seabass, Dicentrarchus labrax (Linnaeus, 1758): morphological and molecular characterization study"],"prefix":"10.1186","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8585-8123","authenticated-orcid":false,"given":"Ebtsam Sayed Hassan","family":"Abdallah","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1168-2951","authenticated-orcid":false,"given":"Awatef Hamed","family":"Hamouda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,8,31]]},"reference":[{"key":"3405_CR1","unstructured":"FAO: Cultured Aquatic Species Information Programme. 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