Experimental infection of American winter flounder (<i>Pseudopleuronectes americanus</i>) with <i>Glugea stephani</i> (Microsporida)

Cali, Ann; Takvorian, Peter M.; Ziskowski, John J.; Sawyer, Thomas K.

doi:10.1111/j.1095-8649.1986.tb05158.x

Cited by 30 publications

(17 citation statements)

References 7 publications

(14 reference statements)

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“…G. hertwigi xenomas examined in the present study were located predominantly in the submucosa and within the mesentery. The presence of the parasite in the submucosa is similar to findings reported by Scarborough & Weidner (1979) of G. hertwigi in Osmerus mordax, and also consistent with findings for G. stephani in winter flounder Pseudopleuronectes americanus (Cali et al 1986). The parasite was not observed in the ovaries, although previous reports demonstrate the ovary as a common site of infection (Chen & Power 1972, Scarborough & Weidner 1979.…”

Section: Discussionsupporting

confidence: 90%

Phylogeny and morphology of Glugea hertwigi from rainbow smelt Osmerus mordax found in Prince Edward Island, Canada

Lovy¹,

Kostka²,

Dyková³

et al. 2009

Dis. Aquat. Org.

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Infection of rainbow smelt Osmerus mordax with the microsporidian Glugea hertwigi was diagnosed for the first time in Prince Edward Island, Canada. The prevalence of infection was 24%, 45 infected out of 187 examined fish captured in February and March 2009. Both large and small xenomas of G. hertwigi observed within the submucosa of the gastrointestinal tract and along the mesentery of the host contained only mature spores. Advanced and degraded xenomas associated with host reaction were described using light and transmission electron microscopy. The first rDNA sequence of G. hertwigi prepared in the present study completed the set of sequences of Glugea spp. available for comparison. The high level of rDNA sequence identity between Glugea spp. suggests that these may be variants of a single species.

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Section: Discussionsupporting

confidence: 90%

Phylogeny and morphology of Glugea hertwigi from rainbow smelt Osmerus mordax found in Prince Edward Island, Canada

Lovy¹,

Kostka²,

Dyková³

et al. 2009

Dis. Aquat. Org.

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“…In contrast with microsporidia in winter flounder (Cali et al 1986), the disease in turbot was associated with a drop in temperature. In most of the cases described previously, the appearance of infections was concomitant with a rise in temperature.…”

Section: Discussionmentioning

confidence: 86%

Tetramicra brevifilum, a potential threat to farmed turbot Scophthalmus maximus

Figueras¹,

Novoa²,

Santarem³

et al. 1992

Dis. Aquat. Org.

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The development of turbot Scophthalmus maximus culture has resulted in an increase of pathological problems involving mainly bacterial infections. During 1990, mortalities were detected in some grow-out facilities in Galicia, Spain, and were attributed to the microsporidian Tetramicra brevifilum Matthews & Matthews, 1980. The outbreak lasted for 3Y2 mo. The start of the outbreak was associated with a drop in temperature. Affected fish showed an erratic swimming behaviour, swelling of different parts of the body, darkening of the dorsal surface, and overproduction of mucus on the surface of the body. Fish with a high intensity of infection had jelly-like muscles. Small xenomas formed by T brevifilum were found to be associated with regressive changes of the host tissue, with agglomerations of mature spores eliciting sometimes inflammatory reaction of the host. The agglutinin titers detected in naturally infected fish were low. There was a light host response. Electrophoresis of sera from naturally infected fish showed an additional protein band (molecular weight: 128 kDa) not found in uninfected samples. Results suggest that although turbot infected with microsporidians are immunologically impaired, the immunodepression does not increase the susceptibility of fish to vibriosis.

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“…Sharp increases in mortality are common in microsporidian host species (Cali et al 1986). Examples include high mortality rates for Atlantic cod (Khan 2005) and salmonids (Hauck 1984) infected with microsporidians.…”

Section: Introductionmentioning

confidence: 98%

“…Populations experiencing declines in abundance commonly undergo concurrent reductions in genetic diversity (Lozier et al 2011), because populations with low abundance are more vulnerable to genetic drift and subsequent extinction risks (Frankham 2005). Moreover, evaluating evidence of genetic bottlenecks (i.e., excessive heterozygosity) is a common tool for detecting recent reductions in abundance resulting from increased mortality or reduced recruitment (Spencer et al 2000;Selkoe and Toonen 2006) that fish populations infected with microsporidians are likely to experience (Cali et al 1986;Khan 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Parasites commonly deteriorate the condition of their host as they consume energetic resources of the host or cause the host to undergo immune responses at an energetic cost (reviewed in Barber et al 2000). Reduced condition and loss of body mass have been observed in fish hosts of microsporidians, including American winter flounder (Pseudopleuronectes americanus) infected by Glugea stephani (Cali et al 1986) and Atlantic cod (Gadus morhua) infected by Loma branchialis (Khan 2005). Additionally, during a period of food deprivation, threespine sticklebacks (Gasterosteus aculeatus) infected by Glugea aculeatus were observed to lose significantly more body mass than uninfected conspecifics (Ward et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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Weak effects of a microsporidian parasite on mottled sculpin in Michigan streams

HomolaJared

IIICarl

KohlerSteven

et al. 2014

Can. J. Fish. Aquat. Sci.

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Despite the widespread occurrence of microsporidian parasites in vertebrates and many invertebrates, research regarding their effects on wild populations remains uncommon. We used several metrics of individual growth, condition, and population characteristics to evaluate the effects of a microsporidian infection (Glugea) on six infected populations of mottled sculpin (Cottus bairdii) compared with 10 nearby uninfected populations. Infected individuals (n = 129) were significantly heavier in each age class when compared with uninfected fish (n = 331), yet other measures of growth and condition indicated little influence of the parasite. No significant parasite-associated effects were found when comparing mortality rates, mean age, sex ratios, and history of population genetic bottleneck between infected and uninfected populations. Additionally, we did not detect significant differences in environmental variables or fish assemblages between streams with and without the parasite. Given the disfiguring nature of infection and the strong effects of microsporidian parasites on other hosts, the lack of significant effects caused by parasitism was unexpected and is likely attributed to strong host density-dependent population dynamics or relatively low host infection intensities.Résumé : Bien que les microsporidies parasites soient répandues chez les vertébrés et de nombreux invertébrés, les travaux sur leurs effets sur les populations sauvages demeurent assez rares. Nous avons utilisé plusieurs mesures de la croissance et de l'état individuels et des caractéristiques de la population pour évaluer les effets d'une infection à microsporidie (Glugea) sur six populations infectées de chabot tacheté (Cottus bairdii) par rapport à 10 populations non infectées voisines. Si les individus infectés (n = 129) étaient significativement plus lourds dans chaque catégorie d'âges comparativement aux poissons non infectés (n = 331), d'autres mesures de la croissance et de l'état indiquaient peu d'influence du parasite. Aucun effet significatif associé au parasite n'a été noté sur le plan des taux de mortalité, de l'âge moyen, du rapport des sexes et de l'historique de goulots d'étranglement génétiques entre les populations infectées et non infectées. En outre, nous n'avons décelé aucune différence significative des variables du milieu ou des assemblages de poissons entre les cours d'eau avec et sans parasites. Étant donné l'effet défigurant de l'infection et les effets importants de microsporidies parasites sur d'autres hôtes, l'absence d'effets significatifs causés par le parasitisme était inattendue et serait vraisemblablement attribuable à une dynamique de la population fortement dépendante de la densité des hôtes ou des intensités d'infection relativement faibles des hôtes. [Traduit par la Rédaction]

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Experimental infection of American winter flounder (Pseudopleuronectes americanus) with Glugea stephani (Microsporida)

Cited by 30 publications

References 7 publications

Phylogeny and morphology of Glugea hertwigi from rainbow smelt Osmerus mordax found in Prince Edward Island, Canada

Phylogeny and morphology of Glugea hertwigi from rainbow smelt Osmerus mordax found in Prince Edward Island, Canada

Tetramicra brevifilum, a potential threat to farmed turbot Scophthalmus maximus

Weak effects of a microsporidian parasite on mottled sculpin in Michigan streams

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