Histological study of a cellular reaction in Ruditpaes decussatus infected by a protozoan Auteur(s) : Chagot, Dominique Comps, Michel Boulo, Viviane Ruano, Francisco Grizel, Henri Éditeur(s) : Aquaculture 67 : 260-261 Résumé : An infection caused by a Perkinsus -like parasite has been observed in Ruditapes decussatus from Portugal (Comps and Chagot, 1987). Following a pathological study carried out on clams affected by mortalities in the Algarve area, this parasite was found again, inducing a reaction process in the host. Histological examination reveals the parasite in the connective tissue of different organs. The adjoining tissues, particularly the epithelia, are not affected. Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/1987/acte-3109.pdf http://archimer.ifremer.fr/doc/00000/3109/ | Partager |
Sur un sporozoaire parasite de Crassotrea rhizophorae (Guilding) Auteur(s) : Comps, Michel Grizel, Henri Tige, Gilbert Éditeur(s) : Académie des Sciences Résumé : Along the French Guiana coast, mainly in the Monsinéry River, there are populations of natural oysters belonging to the species Crassostrea rhizophorae (Guilding). Within the scope of the growth of oyster farming in Guiana, we researched possible parasites of these oysters that are still little studied. This work, conducted based on living and set samples, allowed us to highlight the presence of nematops spores. Sur la côte de la Guyane française, principalement dans la rivière de Montsinéry existent des populations d'huîtres naturelles appartenant à l'espèce Crassostrea rhizophorae (Guilding). Dans le cadre du développement de l'ostréiculture en Guyane, nous avons recherché des parasites éventuels de ces huîtres encore peu étudiées. Ce travail mené à partir d'échantillons vivants et fixés nous a permis de mettre en évidence la présence de spores nématopsidiennes. Comptes Rendus Académie Sciences Paris (Académie des Sciences), 1972-09 , Vol. 275 , N. 15 , P. 1693-1695 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/1972/publication-3008.pdf http://archimer.ifremer.fr/doc/00000/3008/ | Partager |
Rickettsia-like organism infecting juvenile sea-bass Dicentrarchus labrax Auteur(s) : Comps, Michel Raymond, J. C. Plassiart, G. N. Éditeur(s) : European Association of Fish Pathologists (EAFP) Résumé : High levels of mortalities (20%) associated with abnormal swimming have been observed in farmed juveniles of seabass, Dicentrarchus labrax, in Mediterranean coast, southern France. Histopathology was obvious in the brain with nervOUS tissue necrosis and the presence of ceUs containing basophilic granules corresponding to smaU coccoid organisms. Ultrastructural examination revealed these organisms were rickettsia-like organisms morphologicaUy close to Piscirickettsia salmonis Bull. Eur. Ass. Fish Pathol. (European Association of Fish Pathologists (EAFP)), 1996 , Vol. 16 , N. 1 , P. 30-32 Droits : European Association of Fish Pathologists (EAFP) http://archimer.ifremer.fr/doc/1996/publication-6158.PDF http://archimer.ifremer.fr/doc/00000/6158/ | Partager |
Evolution des recherches et études récentes en pathologie des huîtres Auteur(s) : Comps, Michel Éditeur(s) : Gauthier-villars Résumé : Until recently, the study of the pathology of oysters concerned some bacterial and a large number of parsitic diseases. Among the latter, diseases caused by fungi such as Labyrinthomyxa marina or by sporozoa such as Minchinia nelsoni in the American oyster have had very important econimic repercussions in the affected areas. The causes of some severe epizooties, such as the "Malpecue Bay disease" in Canada, have never been determined; in other cases, including the mass mortality of the Portuguese oyster in Fance, several years of investigations have been required before the first results of an etiologic nature were obtained. The use of electron microscopy has permitted great strides in the pathology of oysters. Thus, virus diseases have been found to be associated with the diseases of the Portuguse oyster, with gill disease and with the mass mortality of 1970. New and important data have also been obtained with regard to the structure and development of Marteilia refringens a parasite of the flat oyster which has been recognized as belonging to the haplosporidan species. Recently, Mycoplasma-like and Rickettsia-like organisms have been detected in several oyster species and oyster viruses have been isolated on cell cultures. Such results confirm the evolution of research in this field. Les résultats acquis en matière de pathologie des huîtres concernaient jusqu'à une date récente quelques maladies bactériennes et surtout de nombreuses parasitoses. Pour certaines épizooties graves, comme la maladie de l'huître américaine de Malpèque au Canada, les causes n'ont jamais été déterminées et pour d'autres, comme la mortalité massive de l'huître portugaise en France, les premiers résultats d'ordre étiologique n'ont été obtenus que tardivement avec la mise en évidence d'une infection virale. L'étude ultra-structurale de Marteilia refringens, parasite de l'huître plate, la mise en évidence d'une virose associées à la maladie des branchies de l'huître portugaise, puis la découverte récente de nouveaux germes pathogènes tels que mycoplasmes et rickettsies et l'isolement de virus sur cultures cellulaires chez plusieurs espèces d'huîtres devaient confirmer l'évolution des recherches dans ce domaine. Oceanologica Acta (0399-1784) (Gauthier-villars), 1978 , Vol. 1 , N. 2 , P. 255-262 Droits : 1978 Elsevier http://archimer.ifremer.fr/doc/00015/12631/9520.pdf http://archimer.ifremer.fr/doc/00015/12631/ | Partager |