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This work describes, for the first time, cestodiasis in <jats:italic>M. electricus<\/jats:italic> and <jats:italic>H. bidorsalis<\/jats:italic>. <jats:italic>Corallobothrium solidum<\/jats:italic> and <jats:italic>Proteocephalus<\/jats:italic> sp. were identified morphologically and molecularly from <jats:italic>M. electricus<\/jats:italic> and <jats:italic>H. bidorsalis<\/jats:italic>, respectively. Using PCR, sequencing, and phylogenetic analysis, the two cestodes shared rRNA gene sequence similarities yet were unique and the two new sequences for the proteocephalid genera were submitted to the GenBank database. The prevalence of infection was 75% and 40% for the two fish species, respectively. Infections significantly increased in the summer and spring and were higher in female fish than in male fish. The intestine was the preferred site of the two adult cestodes. However, in the case of <jats:italic>C. solidum<\/jats:italic> some larval cestodes were found outside the intestine in between the skin and abdominal musculature, attached to the mesentery, and within intestinal tunica muscularis. Desquamation of the intestinal epithelium and inflammation at the site of infection in addition to congestion of the intestinal wall of the tapeworm infected fish were evident, indicating that <jats:italic>C. solidum<\/jats:italic> and <jats:italic>Proteocephalus<\/jats:italic> sp. impacted the infected fish. The larval stages of <jats:italic>C. solidum<\/jats:italic> attempted to penetrate the intestine and sometimes they were encircled within fibrous layers infiltrated with inflammatory cells. The infected fish\u2019s musculature was free of cestode infections. Preventive measures should be implemented to prevent the spread of infections.<\/jats:p>","DOI":"10.1186\/s12917-024-04048-1","type":"journal-article","created":{"date-parts":[[2024,5,20]],"date-time":"2024-05-20T06:01:39Z","timestamp":1716184899000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Two proteocephalid cestodes in the fish Malapterurus electricus and Heterobranchus bidorsalis from Lake Nasser, Egypt: a morphological, molecular, and histopathological study"],"prefix":"10.1186","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1168-2951","authenticated-orcid":false,"given":"Awatef Hamed","family":"Hamouda","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7476-9320","authenticated-orcid":false,"given":"Abuelhassan Elshazly","family":"Younis","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,5,20]]},"reference":[{"key":"4048_CR1","unstructured":"Caira JN, Jensen K. 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