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Summary A total of 1134 freshwater fishes belonging to Cyprinidae ( Acanthobrama marmid  (n=20),  Alburnus caeruleus  (n=7),  Alburnus mossulensis  (n=62),  Arabibarbus grypus  (n=123),  Barbus lacerta  (n=7),  Capoeta trutta  (n=222),  C. umbla  (n=161),  Carasobarbus kosswigi  (n=5),  C. luteus  (n=89),  Carassius auratus  (n=54),  Chondrostoma regium  (n=52),  Cyprinion kais  (n=10) and  C. macrostomum  (n=322)) were collected in different water bodies in Sulaimani Province, Kurdistan Region-Iraq for the presence of larval nematode of the genus  Conteacaecum . This investigation revealed that 17 fishes belonged to five species ( A. marmid ,  A. grypus ,  C. trutta ,  C. luteus  and  C. regium ) were infected with  Contracaecum  larvae with prevalence of 35 %, 0.81 %, 0.90 %, 4.49 % and 5.76 %, respectively. The third- larval stage was morphologically studied by optical microscopy, and the ultrastructure was investigated using scanning electron microscopy (SEM). In addition, molecular analysis was carried out by amplifying, sequencing and comparing different gene loci, including internal transcribed spacers (ITS-1 and ITS-2) and cytochrome oxidase c subunit-II (COX-2), of the different isolated  Contracaecum  larvae. These sequences were also compared with closely related nematode sequences from the GenBank. Fifteen sequences were obtained for this study from the collected  Contracaecum  larvae. ITS-1, ITS-2 and COX-2 were amplified by polymerase chain reaction (PCR) and sequenced. The sequences of ITS-1, ITS-2 and COX-2 revealed that the collected  Contracaecum  larval specimens from all infected fish species represented one species ( Contracaecum rudolphii  B) based on the identity percentage in the GenBank database. The genetic characterisation of the parasite in the present study is available in the GenBank database, and the obtained ITS-1, ITS-2 and COX-2 sequences were deposited in GenBank. The present study provides information on the accurate identification and molecular analysis of  Contracaecum  larvae in the infected fish species in Sulaimani Province, Kurdistan Region-Iraq.

helminthologia

Ultramorphology and molecular studies of <i>Contracaecum</i> larvae (Nematoda: Anisakidae) collected in five Cyprinid fish species from Sulaimani Province, Kurdistan Region-Iraq

Ultramorphology and molecular studies of Contracaecum larvae (Nematoda: Anisakidae) collected in five Cyprinid fish species from Sulaimani Province, Kurdistan Region-Iraq