You have a Pseudodactylogyrus anguillae (Yin & Sproston, 1948) or a Pseudodactylogyrus bini (Kikuchi, 1929) – parasitic digeneans in eel
Common names: None known
These species are parasitic on the gills of eels.
Native distribution: East Asia. In the native area these two species parasitize Japanese eel.
Introduced distribution: They have been introduced first with Japanese eels to Russia and later probably with the transport of elvers of either Japanese or European eels. Now they are found in most European countries and are also spreading to North America. First introduced record for P. anguillae was in 1977 in an eel farm in the Soviet Union. The first record in Denmark was in 1985, but at this time it was estimated to have been present for some years. Now it is widespread and common in Danish eels. P. bini was also first found in Denmark in 1985, but this species is still restricted to eel farms and to Esrom Lake, where it probably arrived after a near-by eel farm closed down (Køie, 1988, 1991).
They feed on gill tissues and blood (Buchmann et al., 1987).
Abdelmonem, A.A., Metwally, M.M., Hussein, H.S. and Elsheikha, H.M. 2010. Gross and microscopic pathological changes associated with parasitic infection in European eel (Anguilla anguilla, Linnaeus 1758). Parasitology Research 106: 463-469.
Buchmann, K. 1988. Epidemiology of pseudodactylogyrosis in an intensive eel-culture system. Diseases of Aquatic Organisms 5: 81-85.
Buchmann, K. 1988. Temperature-dependent reproduction and survival of Pseudodactylogyrus bini (Monogenea) on the European eel (Anguilla anguilla). Parasitology Research 75: 162-164.
Buchmann, K. and Bjerregaard, J. 1990. Comparative efficacies of commercially available benzimidazoles against Pseudodactylogyrus infestations in eels. Diseases of Aquatic Organisms 9: 117-120.
Buchmann, K., Køie, M. and Prentø, P. 1987. The nutrition of the gill parasitic monogenean Pseudodactylogyrus anguillae. Parasitology Research 73: 532-537. Buchmann, K., Mellergaard, S. and Køie, M. 1987. Pseudodactylogyrus infections in eel: a review. Diseases of Aquatic Organisms 3: 51-57.
Christison, K.W. and Baker, G.C. 2007. First record of Pseudodactylogyrus anguillae (Yin & Sproston, 1948) (Monogenea) from South Africa. African Zoology 42(2): 279-285.
Gelnar, M., Scholz, T., Matejusová, I. and Konecny, R. 1996. Occurrence of Pseudodactylogyrus anguillae (Yin & Sproston, 1948) and P. bini (Kikuchi, 1929), parasites of eel, Anguilla anguilla L., in Austria. Annalen des Natuhistorischen Museum in Wien 98B: 1-4.
Hayward, C.J., Iwashita, M., Crane, J.S. and Ogawa, K. 2001. First report of the invasive eel pest Pseudodactylogyrus bini in North American eels. Diseases of Aquatic Organisms 44: 53-60.
Jakob, E., Hanel, R., Klimpel, S. and Zumholz, K. 2009. Salinity dependence of parasite infestation in the European eel Anguilla anguilla in northern Germany. ICES Journal of Marine Science 66: 358-366.
Køie, M. 1988. Parasites in European eel Anguilla anguilla (L.) from Danish freshwater, brackish and marine localities. Ophelia 29: 93-118.
Køie, M. 1991. Swimbladder nematodes (Anguillicola spp.) and gill monogeneans (Pseudodactylogyrus spp.) parasitic on the European eel (Anguilla anguilla). Journal du Conseil International pour l'Exploration de la Mer 47: 391-398.
Maillo, P.A., Vich, M.A., Salvadó, H., Marqués, A. and Gracia, M.P. 2005. Parasites of Anguilla anguilla (L.) from three coastal lagoons of the River Ebro delta (Western Mediterranean). Acta Parasitologica 50(2): 156-160.
Matejusová, I., Simková, A., Sasal, P. and Gelnar, M. 2003. Microhabitat distribution of Pseudodactylogyrus anguillae and Pseudodactylogyrus bini among and within gill arches of the European eel (Anguilla anguilla L.). Parasitology Research 89: 290-296. Morozińska-Gogol, J. 2009. Alien species of fish parasites in the coastal lakes and lagoons of the southern Baltic. Oceanologia 51(1): 105-115.
Škoriková, B., Scholz, T. and Moravec, F. 1996. Spreading of inytoduced monogeneans Pseudodactylogyrus anguilla and P. bini among eel populations in the Czech republic. Folia Parasitologica 43: 155-156.
Sobecka, E. and Pilecka-Rapacz, M. 2003. Pseudodactylogyrus anguillae (Yin et Sproston, 1948) Gussev, 1965 and P. bini (Kikuchi, 1929) Gussev, 1965 (Monogenea: Pseudodactylogyridae) on gills of European eel, Anguilla anguilla (Linnaeus, 1758) ascending rivers of the Pomeranian coast, Poland. Acta Ichthyologica et Piscatoria 33(2): 137-143.
Sures, B. and Streit, B. 2001. Eel parasite diversity and intermediate host abundance in the River Rhine, Germany. Parasitology 123: 185-191. Székely, C. and Molnár, K. 1987. Mebendazole is an efficacious drug against pseudodactylogyrosis in the European eel (Anguilla anguilla). Journal of Applied Ichthyology 3(4): 183-186.