Abstract
The dracunculoid nematode Philonema oncorhynchi Kuitunen-Ekbaum, 1933 is redescribed from specimens collected from three species of anadromous Pacific salmon, i.e. Oncorhynchus keta (Walbaum), O. kisutch (Walbaum) and O. nerka (Walbaum), from Japan, North Pacific Ocean and eastern Russia (Kamchatka), respectively. Scanning electron microscopy revealed the presence of hitherto undescribed cuticular ornamentations on the male caudal end and made it possible to establish the numbers, distribution and shape of cephalic and caudal papillae in the male, which are hardly visible under a light microscope; two horn-like protrusions and a median pre-anal papilla situated on the anterior cloacal lip were not previously described in this species. The necessity of detailed morphological studies on Philonema spp. parasitic in salmonids for the clarification of their taxonomy is stressed.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Adamson, M.L., Clease, D.F. & Margolis, L. (1992) Differenti-ation of Philonema spp. (Nematoda: Philometridae) in British Columbia salmonid fishes using DNA restriction fragment length differences. Canadian Journal of Fisheries and Aquatic Sci-ences, 49, 1,650–1,656.
Akhmerov, A.Kh. (1955) Parasite fauna of the fishes of the Kamchatka River. Izvestiya Tikhookeanskogo Nauchno-Issledovatelskogo Instituta Rybnogo Khozyaystva i Okeanografii, 43, 99–137 (in Russian).
Bashirullah, A.K.M. (1967) The development and maturation of Philonema species (Nematoda: Philometridae) in salmonid hosts with different life histories. Dissertation Abstracts, 27, 3,332.
Bauer, O.N. (ed.) (1987) Key to parasites of the USSR freshwater fish fauna.Part3.Parasitic metazoans 2. Leningrad: Nauka, 583 pp. (In Russian).
Baylis, H.A. (1948) On two nematode parasites of fishes. Annals and Magazine of Natural History, 14, 327–335.
Ivashkin, V.M., Sobolev, A.A. & Khromova, L.A. (1971) Camal-lanata of animals and man and the diseases caused by them. Osnovy Nematodologii, 22, 388 pp. (in Russian).
Kuitunen-Ekbaum, E. (1933) Philonema oncorhynchi nov. gen. et spec. Contributions to Canadian Biology and Fisheries,New Series, 8, 71–75.
Margolis, L. (1963) Parasites as indicators of the geographical ori-gin of sockeye salmon, Oncorhynchus nerka (Walbaum), occur-ring in the North Pacific Ocean and adjacent seas. International North Pacific Fishery Commission Bulletin, 11, 101–156.
Margolis, L. & Arthur, J.R. (1979) Synopsis of the parasites of fishes of Canada. Bulletin of the Fisheries Research Board of Canada, 199,1–269.
McDonald, T.E. & Margolis, L. (1995) Synopsis of the parasites of fishes of Canada: supplement (1978–1993). Canadian Special Publications of Fisheries and Aquatic Sciences, 122, 1–265.
Moravec, F. (1994) Parasitic nematodes of freshwater fishes of Eu-rope.Prague and Dordrecht, Boston, London: Academia and Kluwer Academic Publishers, 473 pp.
Moravec, F., Urawa, S. & Coria, C.O. (1997) Philonema perci-chthydis sp. n. (Nematoda: Philometridae) from the Patagonian smallmouth perch Percichthys trucha (Pisces) from Argentina. Helminthologia, 34, 215–219.
Nagasawa, K. (1985) Prevalence of visceral adhesions in sockeye salmon, Oncorhynchus nerka, in the central North Pacific Ocean. Fish Pathology, 20, 313–321.
Nagasawa, K. (1987) Prevalence of visceral adhesions in sockey salmon (Oncorhynchus nerka) in the North Pacific Ocean and Bering Sea. In: Smith, H.D., Margolis, L. & Wood, C.C. (eds) Sockeye salmon (Oncorhynchus nerka) population biology and future management.Canadian Special Publications of Fisheries and Aquatic Sciences, 96, 243–253.
Nagasawa, K., Urawa, S. & Awakura, T. (1987) A checklist and bib-liography of parasites of salmonids of Japan. Scientific Reports of Hokkaido Salmon Hatchery, 41, 1–75.
Nagasawa, K., Urawa, S. & Dubinin, V.A. (1994) A parasitologi-cal survey of sockeye salmon (Oncorhynchus nerka) and dolly.74 varden (Salvelinus malma) from the Ozernaya River system, Kamchatka. Scientific Reports of Hokkaido Salmon Hatchery, 48, 17–21.
Platzer, E.G. & Adams, J.R. (1967) The life history of a dracuncu-loid, Philonema oncorhynchi,inOncorhynchus nerka. Canadian Journal of Zoology, 45, 31–43.
Rumyantsev, E.A. (1965) The finding of Philometra sibirica (Bauer, 1946) (Nematoda, Dracunculidae) in vendace in Karelia. Zoo-logicheskii Zhurnal, 44, 1082–1083 (in Russian).
Smedley, E.M. (1933) Nematode parasites from Canadian marine and freshwater fishes. Contributions to Canadian Biology and Fisheries, New Series, 8, 169–179.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Moravec, F., Nagasawa, K. New data on the morphology of Philonema oncorhynchi Kuitunen-Ekbaum, 1933 (Nematoda: Dracunculoidea) from the abdominal cavity of Pacific salmon (Oncorhynchus spp.). Syst Parasitol 43, 67–74 (1999). https://doi.org/10.1023/A:1006181528423
Issue Date:
DOI: https://doi.org/10.1023/A:1006181528423