Myxozoan infection in the muscle layer of the intestine of Rhamdia quelen from the Amazon River Basin, Brazil

Abrunhosa, Jacqueline Pompeu; Velasco, Michele; Sindeaux-Neto, José Ledamir; Santos, Patrícia dos; Matos, Patrícia; Sanches, Osimar de Carvalho; Matos, Edílson

doi:10.1590/0103-8478cr20151652

Cited by 3 publications

(5 citation statements)

References 8 publications

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“…In the Amazon region, recent studies have described occurrences of Myxobolus sp. and Myxobolus marajoensis in the intestinal muscle of Siluriformes fish on the island of Marajó, Pará, Brazil (Abrunhosa et al, 2016(Abrunhosa et al, , 2017. Also in the state of Pará, Capodifoglio et al (2019Capodifoglio et al ( , 2020a described Myxobolus matosi, Myxobolus longissimus, Myxobolus colossomatis, Myxobolus arapiuns and Myxobolus pirapitingae, parasitizing Characiformes hosts in the Tapajós river basin; and Sindeaux-Neto et al (2021) published the description of the species Myxobolus freitasi, a parasite of the central nervous system of Gymnotiformes fish in the Peixe-Boi river basin, in the eastern portion of the Brazilian Amazon region.…”

Section: Introductionmentioning

confidence: 98%

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Phylogeny and ultrastructure of Myxobolus rangeli n. sp. (Myxozoa, Bivalvulida), a histozoic parasite in Siluriformes fish from the Amazon region

Silva

Giese

et al. 2023

Rev. Bras. Parasitol. Vet.

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A new species of Myxobolus parasitizing the arterial bulb and cardiac musculature of the freshwater fish Pimelodus ornatus Kner, 1858, from the Arari river in the municipality of Cachoeira do Arari, island of Marajó, Pará, Brazil, was described. In the present study, the observed prevalence of myxozoan parasites in the heart tissue of the hosts was 20% (6/30). The myxozoans observed had mature biconvex spores, slightly rounded, an anterior end with two pyriform polar capsules and a posterior end with very evident sporoplasm, measuring 8 ± 0.2 μmin length. The spore width was 5.8 ± 0.4 μm, with a thickness of 3.4 ± 0.2μm. The length of the polar capsules was 3.6 ± 0.3 μm and the width was 1.2 ± 0.2μm, with 6 to 7 turns of the polar filament. The divergences observed, regarding the morphometric and genetic structure of SSU rDNA, in relation to other Myxobolidae already described in the literature, confirm the description of the new species Myxobolus rangeli n. sp.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Phylogeny and ultrastructure of Myxobolus rangeli n. sp. (Myxozoa, Bivalvulida), a histozoic parasite in Siluriformes fish from the Amazon region

Silva

Giese

et al. 2023

Rev. Bras. Parasitol. Vet.

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“…Despite being exploited widely as a source of human food, few studies are available on the parasitism of this species, except for Matos et al (2005), who described the myxosporean Henneguya rhamdia, found in the gills of this catfish. More recently, Abrunhosa et al (2016) reported on the occurrence of cysts caused by Myxobolus, which caused inflammatory processes in the intestine of the R. quelen.…”

Section: Introductionmentioning

confidence: 99%

Myxobolus marajoensis sp. n. (Myxosporea: Myxobolidae), parasite of the freshwater catfish Rhamdia quelen from the Brazilian Amazon region

Abrunhosa

Sindeaux-Neto

Santos

et al. 2017

Rev. Bras. Parasitol. Vet.

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This study provides morphological and molecular data of a new parasite species found in the muscle layer of the intestinal tract of the South American silver catfish, Rhamdia quelen from Marajó Island region (Pará State, Brazil), an important fishery resource with recognized potential for fish farming. The morphology of these parasites was reanalyzed and phylogenetic analyses were run on their 18S rDNA gene sequences. The spores were morphologically distinct from those of other Myxobolus species described previously. The obtained partial sequence of the 18S rDNA gene sequences of the new species were compared to those of 24 other Myxobolus and Henneguya species available in GenBank. The results of morphological and molecular analyses indicated clearly the existence of a new species, Myxobolus marajoensis sp. n.

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“…Silver catfish is the native fish most studied in Brazil, and improvement of its production is continuously being sought. The species can be found throughout Brazilian waters, which may vary from the clear acidic‐neutral waters in South Brazil (Souza et al., ) to the acidic blackwater in North Brazil (Matos et al., ; Abrunhosa et al., ). Specimens that do not inhabit DOC‐enriched acidic waters are possibly not adapted to the naturally occurring beneficial effects promoted by DOC.…”

Section: Introductionmentioning

confidence: 99%

“…Silver catfish is the native fish most studied in Brazil, and improvement of its production is continuously being sought. The species can be found throughout Brazilian waters, which may vary from the clear acidic-neutral waters in South Brazil (Souza et al, 2016) to the acidic blackwater in North Brazil (Matos et al, 2005;Abrunhosa et al, 2016).…”

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confidence: 99%

Humic acid of commercial origin causes changes in gill morphology of silver catfish Rhamdia quelen exposed to acidic water

et al. 2017

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The effect of dissolved organic carbon (DOC) against the burden of low pH was assessed in silver catfish Rhamdia quelen through the gills. A commercial humic acid (HA) was used as the source of DOC at 0 (control), 10, 25, and 50 mg/l. For each HA concentration, two pH levels were tested: 6.5 (control) and 5.5. After 40 days of exposure, the gills were removed and morphological variables were analyzed through light and scanning electronic microscopy. The low water pH caused a reduction in the length of filaments, number of lamellae, and gill respiratory surface area (GRSA) and an increase in chloride cells (CCs) number in the filament epithelium. When HA was added to the test water, GRSA increased and CCs proliferated in lamellae, suggesting ionic and respiratory disturbances. Scanning electronic microscopy revealed that CC morphometric variables, that is, apical area, fractional area, and density, were undisturbed by the pH reduction, but increased in the presence of HA. This study indicates that the commercial HA did not protect silver catfish against low pH stress. Instead, it caused changes that may affect vital processes such as ion regulation and ventilation and, consequently, reduce growth.

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Myxozoan infection in the muscle layer of the intestine of Rhamdia quelen from the Amazon River Basin, Brazil

Abstract: The present study investigated

Cited by 3 publications

References 8 publications

Phylogeny and ultrastructure of Myxobolus rangeli n. sp. (Myxozoa, Bivalvulida), a histozoic parasite in Siluriformes fish from the Amazon region

Phylogeny and ultrastructure of Myxobolus rangeli n. sp. (Myxozoa, Bivalvulida), a histozoic parasite in Siluriformes fish from the Amazon region

Myxobolus marajoensis sp. n. (Myxosporea: Myxobolidae), parasite of the freshwater catfish Rhamdia quelen from the Brazilian Amazon region

Humic acid of commercial origin causes changes in gill morphology of silver catfish Rhamdia quelen exposed to acidic water

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