<i>Microsporidium rhabdophilia</i> n. sp. from rodlet cells of salmonid fishes

Modin, J. C.

doi:10.1111/j.1365-2761.1981.tb01127.x

Cited by 18 publications

(18 citation statements)

References 10 publications

(7 reference statements)

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“…The possible relationship of the microsporidian we observed to Microspondium rhabdophllia needs to be further examined. Although no ultrastructural studies were conducted, Modin (1981) described a spore of similar size and intranuclear location in several salmonid specl.es, including chinook sal.mon. He did not, however, observe the parasite other than in rodlet cells.…”

Section: Discussionmentioning

confidence: 99%

“…Several species have been detected in salmonids but there are only 3 reports of microsporida that are found within the nuclei of parasitized cells. Modin (1981) detected a microsporidian, Microsporidium rhabdophilia, in the nuclei of the rodlet cells of several salmonid species in California, USA. Although M. rhabdophilia was found to be widely distributed among salmonids, no pathological changes were reported among infected fish (Modin 1981).…”

Section: Introductionmentioning

confidence: 99%

“…Modin (1981) detected a microsporidian, Microsporidium rhabdophilia, in the nuclei of the rodlet cells of several salmonid species in California, USA. Although M. rhabdophilia was found to be widely distributed among salmonids, no pathological changes were reported among infected fish (Modin 1981). Elston et al (1987) detected infections associated with an anemia in 3-yr-old chinook salmon Oncorhynchus tshawytscha reared in seawater net-pens in Washington state, USA.…”

Section: Introductionmentioning

confidence: 99%

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Hematopoietic intranuclear microsporidian infections with features of leukemia in chinook salmon Oncorhynchus tshawytscha

Hedrick¹,

Groff²,

McDowell³

et al. 1990

Dis. Aquat. Org.

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Intranuclear infections of hematopoietic cells with characteristics of lymphoblasts were detected in juvenile chinook salmon Oncorhynchus tshawytscha with a leukemic condition. The rnicrosporidian infection was associated wlth an anemia secondary to the proliferat~on of hematopoietic cells in the kidney and spleen. Many of the nuclei of these lymphoid cells contained plasmod~a and sporogonic stages of the microsporidian. Infected cells occurred in the kidney and spleen but were also found in the blood, eye, brain, muscle, liver, pancreas, intestine, peritoneum and gill. Spores develop from multinucleated sporogonial plasmodia which contain polar tube precursors. Spores are ovoid (1.0 X 2.0 km), have a thln exospore and poorly developed endospore surrounding a complex of membranes (polaroplast), a posterior vacuole, nucleus and cytoplasm containing a polar tube with 4 to 5 turns. The characteristic sporogony and spore morphology of the salmonid microsporidian is found only in the genus Enterocytozoon. The microsporidian stimulates an abnormal proliferation of host lymphoblasts and the subsequent migration and invasion of these infected host cells into various tissues resulted in a leukemic condition. A similar disease has recently been described among adult chinook salmon reared in seawater net-pens in British Columbia, Canada. The microsporidlan was transmitted to prev~ously uninfected kokanee salmon 0. nerka by intraperitoneal injections of cells obtained from kidney homogenates of naturally-infected chinook salmon. These kokanee salmon also developed a similar leukemic condition to that observed in chinook salmon.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hematopoietic intranuclear microsporidian infections with features of leukemia in chinook salmon Oncorhynchus tshawytscha

Hedrick¹,

Groff²,

McDowell³

et al. 1990

Dis. Aquat. Org.

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“…Although numerous species occur in fish, there are few MATERIALS AND METHODS reports of rnicrosporidia found within the host cell nucleus. Modin (1981) described Microsporidium rhabdoSamples of moribund fish from a saltwater recirculaphilia in the nuclei of rodlet cells of several species of tion facility were submitted to the Fish Health Unit, salrnonids in fresh water. However, the presence of Atlantic Veterinary College, Charlottetown, PEI, these parasites was not associated with clinical signs or Canada, for histopathological examination on 4 occadisease.…”

Section: Introductionmentioning

confidence: 99%

An intranuclear microsporidian in lumpfish Cyclopterus lumpus

Mullins¹,

Powell²,

Cawthorn³

1994

Dis. Aquat. Org.

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Chronic mortalities in lumpfish Cyclopterus lumpus raised in a saltwater recirculation system were associated with the presence of an intranuclear rnicrosporidian. Morphologic changes were characterized by infdtration of lymphocyte-like cells predominantly in the renal interstitium and also in the spleen, liver, gills, stomach, pyloric caecae, heart, ovary and mesenteric fat. Affected cell nuclei contained 1 to more than 6 spherical to oval eosinophilic bodies which stained poorly with hematoxylin and eosin and Giemsa. Ultrastructurally, spores were ovoid (2.1 X 1.0 pm) with a polar tube with 11 turns. The morphology of these spores place them in the genus Enterocytozoon. These spores resemble E. salmonis in salmonids, and Microsporidia rhabdophilia in the rodlet cells of salmonids.

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“…Five species are capable of development in the nucleus of their host cell. Two species are salmonid parasites: Nucleospora salmonis (Hedrick, Groff et Baxa, 1991) in various salmonid species (see below) and Microsporidium rhabdophilia Modin, 1981 in Oncorhynchus sp. Others are in marine and freshwater fishes, respectively Nucleospora sp.…”

mentioning

confidence: 99%

Occurrence of the microsporidian parasite Nucleospora salmonis in four species of salmonids from the Massif Central of France

Alaoui¹,

Grésoviac²,

Vivarès³

2006

FOLIA PARASIT

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Abstract. Nucleospora salmonis (Hedrick, Groff et Baxa, 1991), an intranuclear microsporidian parasite of marine and freshwater fish, causes diseases mainly in salmonid species. Losses have been reported in stocks of salmonid fish reared in the region of Auvergne (France). The cause of chronic mortalities in the local host species raised in aquaculture and destined for supplementation of the river system Loire-Allier was examined. The presence of N. salmonis was confirmed by PCR and histology in Salmo salar L. previously and in newly investigated salmonid species, Salmo salar, Salmo trutta fario L., Thymallus thymallus (L.) and Salvelinus alpinus (L.), present in European streams. The infection by N. salmonis was consistent in all cases with characteristic symptoms of the disease in deceased or moribund fish. The small subunit ribosomal DNA from N. salmonis was partially sequenced and compared to previously characterised N. salmonis isolates. As a result, a genotype, or clonal entity, was attributed to N. salmonis among Atlantic salmon found along the Northern Atlantic coastal lines and other salmonid species co-inhabiting or co-cultivated in the Auvergne region.

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Microsporidium rhabdophilia n. sp. from rodlet cells of salmonid fishes

Cited by 18 publications

References 10 publications

Hematopoietic intranuclear microsporidian infections with features of leukemia in chinook salmon Oncorhynchus tshawytscha

Hematopoietic intranuclear microsporidian infections with features of leukemia in chinook salmon Oncorhynchus tshawytscha

An intranuclear microsporidian in lumpfish Cyclopterus lumpus

Occurrence of the microsporidian parasite Nucleospora salmonis in four species of salmonids from the Massif Central of France

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