An investigation on the helminth fauna of some fish species distributed in Işıklı lake (Çivril/Denizli)

In this study, a total of 310 fish, including 90 pike (Esox lucius), 93 carp (Cyprinus carpio), and 127 tench (Tinca tinca) fish caught from Lake Işıklı, Çivril district of Denizli province between April 2024 and December 2024, were examined parasitologically. 73 parasite individuals were detected in Esox lucius, 354 in Cyprinus carpio, and 9737 in Tinca tinca. As a result of this study, the distribution of parasite species detected in the 310 fish examined according to fish species was as follows: Raphidascaris acus (adult and larval stage) from the Nematoda group, and Argulus foliaceus from the Crustacea group were detected in Esox lucius. In Cyprinus carpio, Dactylogyrus extensus, Diplozoon paradoxum (adult and larval (diporpa) stage) from the Monogenea group, Rhabdochona denudata and Raphidascaris acus from the Nematoda group were detected. In Tinca tinca, Asymphylodora tincae from the Digenea group, Ligula intestinalis from the Cestoda group, and Streptocara sp. from the Nematoda group were found. According to the findings, Raphidascaris acus for Esox lucius, Rhabdochona denudata for Cyprinus carpio, and Asymphylodora tincae for Tinca tinca were detected as the dominant parasites in these fish species. In this study, the first detection of Diplozoon paradoxum larva (diporpa) in carp and the detection of tench as a paratenic host for Streptocara sp. are important new records for the parasite fauna of Türkiye. KEYWORDS: Cyprinus carpio, Çivril, Esox lucius, helminth fauna, Işıklı Lake, Tinca tinca