Jacques Ngor DIOUF, Bhen Sikina TOGUEBAYE

An ultrastructural study on the merogonic stages of Goussia senegalensis (Faye, 1988) Diouf and Toguebaye, 1993 (Apicomplexa, Coccidia) from the liver of Pagellus bellottii (Pisces, Teleostei)

Little is known about the merogony of coccidians from fishes in Africa. To our knowledge, including both freshwater and marine fishes, developmental stages have been recorded for only Goussia cichlidarum, Cryptosporidium sp. parasitizing the stomachs of juvenile cichlid fish, and Eimeria (s. l.) vanasi. A survey of coccidians parasitizing marine fishes from the coast of Senegal (West Africa) was done between 1988 and 1992 and samples of infected organs were collected for further transmission electron microscopy observations. Merogonic stages were observed. Goussia senegalensis undergoes merogony in the hepatic cells of Pagellus bellottii as follows: meronts develop inside the cytoplasm of the hepatocytes and merozoites develop from them through endodyogeny and endopolygeny. Early meronts are uninucleate, but for most advanced meronts the single large nucleus is divided into 2 or more nuclei as the pellicle precursors of new merozoites arise. In this study, those associated with invaginations of the inner membrane were then arranged around portions of the cytoplasm, each including one nucleus. Mature meronts contained either 2 or several merozoites. At least 2 generations of merozoites developed.

Anahtar Kelimeler:

Key words: Coccidian, ultrastructure, Goussia senegalensis, merogony, Pagellus bellottii

An ultrastructural study on the merogonic stages of Goussia senegalensis (Faye, 1988) Diouf and Toguebaye, 1993 (Apicomplexa, Coccidia) from the liver of Pagellus bellottii (Pisces, Teleostei)

Keywords:

ultrastructure, Goussia senegalensis, merogony, Pagellus bellottii, Coccidian,

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Baska, F. and Molnár, K. 1989. Ultrastructural observations on different developmental stages of Goussia sinensis (Chen, 1955), a parasite of the silver carp (Hypophthalmichthys molitrix Valenciennes, 1844). Acta Vet. Hung. 37(1–2): 81–87.
Daoudi, F. 1987. Coccidies et coccidioses de poissons méditerranéens: systématique, ultrastructure et biologie, PhD thesis, Université des Sciences et Techniques du Languedoc, Montpellier II, France, 300 pp.
Davies, A.J. 1978. Coccidian parasites of intertidal fishes from Wales: systematics, development, and cytochemistry. J. Protozool. 25(10): 15–21.
Diouf, J.N. and Toguebaye, B.S. 1993. Studies of coccidian parasites of fish from the coast of Senegal (West Africa): new species of the genus Goussia (Apicomplexa, Eucoccidiida, Calyptosporidae). Zool. Scr. 22(2): 117–126.
Duszynski, D.W., Couch, L. and Upton, S.J. 2000. Coccidia (Eimeriidae) of Perciformes. In: Coccidia of the World. NSF – PEET DEB 9521687.
Dyková, I. and Lom, J. 1981. Fish coccidia: critical notes on life cycle, classification and pathogenicity. J. Fish Dis. 4: 487–505.
Hawkins, W.E., Fournie, J.W. and Overstreet, R.M. 1984. Intrahepatic stages of Eimeria funduli (Protista: Apicomplexa) in the Longnose killifish, Fundulus similis. Trans. Am. Micros. Soc. 103(2): 185–194.
Jastrzebski, M. 1989. Ultrastructural study on the development of Goussia aculeati, a coccidium parasitizing the three-spined stickleback Gasterosteus aculeatus. Dis. Aquat. Org. 6: 45–53.
Landsberg, J.H. and Paperna, I. 1985. Goussia cichlidarum n. sp (Barrouxiidae, Apicomplexa), a coccidian parasite in swimbladder of cichlid fish. Z. Parasitenkd. 71: 199–214.
Landsberg, J.H. and Paperna, I. 1986. Ultrastructural study of the coccidian Cryptosporidium sp. from stomachs of juvenile cichlid fish. Dis. Aquat. Org. 2: 13–20.
Landsberg, J.H. and Paperna, I. 1987. Intestinal infections by Eimeria (s. l.) vanasi n.sp (Eimeriidae, Apicomplexa, Protozoa) in cichlid fish. Ann. Parasitol. Hum. Comp. 62: 283–293.
Marinček, M. 1973. Développement d’Eimeria subepithelialis (Sporozoa, Coccidia) parasite de la carpe. Acta Protozool. 12: 195–215.
Molnár, K. and Baska, F. 1986. Light and electron microscopic studies on Epieimeria anguillae (Léger & Hollande, 1922), a coccidium parasitizing the European eel, Anguilla anguilla L. J. Fish Dis. 9: 99–110.
Paterson, W.B. and Desser, S.S. 1981. An ultrastructural study of Eimeria iroquoina Molnár & Fernando, 1974 in experimentally infected fathead minnows (Pimephalas promelas, Cyprinidae) 3. Merogony. J. Protozool. 28(2): 302–308.
Paterson, W.B. and Desser, S.S. 1982. The biology of two Eimeria species (Protista: Apicomplexa) in their mutual fish hosts in Ontario. Can. J. Zool. 60: 764–775.
Scholtyseck, E. 1973. Ultrastructure. In: The Coccidia (Eds. D.M Hammond and P.L. Long), University Park Press, Baltimore, Maryland, USA, pp. 81–144.
Steinhagen, D. 1991. Ultrastructural observations on merogonic and gamogonic stages of Goussia carpelli (Apicomplexa, Coccidia) in experimentally infected common carp Cyprinus carpio. Eur. J. Protistol. 27(1): 71–78.