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Between 2015 and 2020, 2 092 specimens of cartilaginous fishes (Chondrichthyes: Elasmobranchii) belonging to eight species and five genera were sampled along the Tunisian coast and examined for their cymothoid parasites, Among the eight examined elasmobranch species, only three were infested, Five parasite species were identified:  Anilocra physodes, Emetha audouini, Ceratothoa oestroides, C. parallela  and  Nerocila orbignyi , These parasites presented three maturation stages: ovigerous females of A. physodes  and  E. audouini , adult non-ovigerous females of  N. orbignyi , and juvenile females of  C. oestroides  and  C. parallela , Most of these parasitic isopods were found on a single host species except for the two  Ceratothoa  species. We report new host-parasite associations, including the presence of A.  physodes  and  E.audouini  on smooth-hound  Mustelus mustelus , the occurrence of  C. oestroides  and  N. orbignyi  on cartilaginous fish species, and the presence of  C. parallela  on black smooth-hound  Mustelus punctulatus  and  M. mustelus.  Parasitological indices and the seasonal variation in prevalence of the collected cymothoids, as well as parasitic species richness, are presented.

New host–parasite associations of Cymothoidae (Crustacea, Isopoda) infesting elasmobranch fishes in Tunisian waters