First records of digenean trematodes of two fishes (Teleostei Sparidae) from the West Algerian coast and comparative study with Tunisian coast (Mediterranean Sea West)

摘要

Two species of the Teleostean Diplodus Rafinesque, 1810 Sparidae fish, Diplodus sargus (Lin- naeus, 1758) (n = 134) and D. annularis (Linnaeus, 1758) (n = 60), from the Algerian west coast were examined with regards to Digenea parasites occurrence between March 2013 and December 2014. This investigation led to inventory 12 species of Digenea (Lepidauchen stenostoma, Arnola microcirrus, Magnibursatus bartolii, Proctoeces maculatus, Holorchis pycnoporus, Lepocreadium album, Wardula sarguicola, Monorchis sp., Macvicaria crassigula, Pseudopycnadena fischtali, Diphterostomum brusinae and Zoogonus rubellus). These species are reported in the selected locality situated in Oran bay for the first time. Furthermore, Le- pidauchen stenostoma in D. annularis is reported for the first time in the western Mediter- ranean. The majority of the recorded digeneans colonize one or two parts of the host digestive tract, the intestine being the most parasitized site. The calculation of epidemiologic indices provides information on the occurrence of digeneans identified in these two hosts. The diversity of Digenea is compared with that of the Gulf of Tunis, the Bizerte lagoon and another locality in the western Mediterranean. The Algerian west coast shows the highest value in the species richness of digeneans as compared to that of all the Mediterranean coasts.