Digenean parasites in two congeneric sparid fish and of commercial importance, Pagellus erythrinus (Linnaeus, 1758) and Pagellus acarne (Risso, 1827), from the western Mediterranean coast of Algeria

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The investigation into the digenean fauna of two congeneric sparid fishes (Perciformes Sparidae), Pagellus erythrinus (Linnaeus, 1758) and Pagellus acarne (Risso, 1827), was carried out in the Algerian coasts (Western Mediterranean).These fishes of commercial importance represent an important biological resource for the human population along the Mediterranean coasts.However, the data on their digenean parasites in Algeria are incomplete and the aim of this study is to provide new data on the diversity and species composition of digeneans from these hosts.A total of 240 fishs (120 of each species) were collected from Oran (Northwestern Algeria) during 12 months between September 2016 and August 2017.Eleven species of digeneans were found in the two fish hosts: (i) Lepocreadium pegorchis (Lepocreadiidae); Lepocreadium album (Lepocreadiidae); Holorchis pychnoporus (Lepocreadiidae); Holorchis spp (Lepocreadiidae); Hemiurus comminus (Hemiuridae); Hemiurus luehei (Hemiuridae); Lepidauchen stenostoma (Acanthocolpidae) and Pachycreadium carnosum (Opecoelidae); Macvicaria crassigula (Opecoelidae) in Pagellus erythrinus; (ii) Lepocreadium pegorchis (Lepocreadiidae); Macvicaria crassigula (Opecoelidae); Zoogonus spp (Zoogonidae) and Hemiurus communis (Hemiuridae) in Pagellus acarne.In the evaluation of the dynamics of the epidemiological index of the community of digenean parasites, two species of fish show seasonal variations.Furthermore, higher prevalence of infestation were registered during the summer season for the Opecaelidae family in the two hosts.

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