Rickettsia-Associated Mortality of the Yellow Clam<i>Mesodesma mactroides</i>(Bivalvia: Mesodesmatidae) in Southern Brazil

Carvalho, Yuri Bovi Morais; Poersch, Luís; Romano, Luís Alberto

doi:10.4002/040.056.0217

Cited by 18 publications

(14 citation statements)

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“…Surveillance of the yellow clam population from the coast of Rio Grande do Sul State started in 2011, and since that time mass mortality events involving small, recently settled juveniles have been recorded in the spring. According to Carvalho et al (2013), these mortalities are associated with the presence of Rickettsia. Nevertheless, myriad factors could be contributing to them.…”

Section: Discussionmentioning

confidence: 99%

Use of Polymerase Chain Reaction for Bivalve Pathogen Surveillance in the Yellow Clam Mesodesma mactroides

et al. 2016

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The yellow clam Mesodesma mactroides is a valuable shellfish occurring from the southeastern coast of Brazil to the northern coast of Argentina. Populations of yellow clams are disappearing from their entire range, and the cause is still unknown. The objective of this paper was to search for World Organisation for Animal Health (OIE)-listed pathogens and their relatives in the genera Marteilia, Bonamia, and Perkinsus as well as Mikrocytos mackini and the virus OsHV-1 μ var the yellow clam population in southern Brazil using molecular techniques and classic histology protocols. A total of 180 clams were manually collected in the intertidal region at six sampling points covering the entire coast of Rio Grande do Sul State (length, 622 km) in 2013. Tissue samples were tested by OIE-recommended single-step conventional polymerase chain reaction assays. The screening showed no evidence of the specific sequences of the protistan parasites and viral pathogens at any site within the six zones under study. We recommend continuous monitoring of the mollusks in the region. Received July 3, 2015; accepted February 3, 2016.

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Section: Discussionmentioning

confidence: 99%

Use of Polymerase Chain Reaction for Bivalve Pathogen Surveillance in the Yellow Clam Mesodesma mactroides

et al. 2016

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“…Although RLO infections in teleost fish have been extensively studied (Rozas & Enr ıquez, 2014;Stride, Polkinghorne, & Nowak, 2014), those affecting molluscs, other than the RLO causing withering syndrome in abalone, have not (Tavers et al, 2015). RLOs have been associated with diseases and mortality in scallops, abalone, clams and oysters (Carvahlo, Poersch, & Romano, 2013;Moore, Robbins, & Friedman, 2000;Sun & Wu, 2004). Because the taxonomy of RLOs is poorly resolved, it is difficult to know at this stage whether RLOs observed in New Zealand molluscs are all the same species, are the causes of mortality events observed in toheroa (or other shellfish species), or whether the toheroa RLOs are native or introduced.…”

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confidence: 99%

“…Although RLO infections in teleost fish have been extensively studied (Rozas & Enríquez, ; Stride, Polkinghorne, & Nowak, ), those affecting molluscs, other than the RLO causing withering syndrome in abalone, have not (Tavers et al., ). RLOs have been associated with diseases and mortality in scallops, abalone, clams and oysters (Carvahlo, Poersch, & Romano, ; Moore, Robbins, & Friedman, ; Sun & Wu, ). Although not all RLO infections result in mortality, information relating to the immune responses of molluscs to RLOs is scarce (Gollas‐Galván et al., ).…”

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First detection of gas bubble disease and Rickettsia‐like organisms in Paphies ventricosa, a New Zealand surf clam

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Jones

et al. 2017

Journal of Fish Diseases

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“…The decline of the yellow clam has been attributed to various factors, such as the presence of toxic algae (Odebrecht et al 1995;Fiori and Cazzaniga 1999) and the presence of parasites (Cremonte and Figueras 2004). Recently, a surge in yellow clam mortality was observed along the south coast of Rio Grande do Sul, and bacteria from the genus Rickettsia were identified as the cause (Carvalho et al 2013b).…”

Section: Discussionmentioning

confidence: 99%

Immunological Profile of the Yellow Clam Mesodesma mactroides (Mesodesmatidae) from the Southern Coast of Rio Grande do Sul, Brazil

et al. 2016

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The yellow clam Mesodesma mactroides (Mesodesmatidae) is a sandy beach bivalve that is distributed from Rio de Janeiro, Brazil, to the south of Buenos Aires province, Argentina. The yellow clam population has been declining in recent decades. To increase our understanding of this species, we evaluated the immunological status of yellow clams collected during different seasons from various areas in the state of Rio Grande do Sul, Brazil. We characterized the hemocytes, determined the differential hemocyte counts (DHCs), calculated the apoptotic index, and evaluated the incidence of parasites in yellow clams through histological analysis. We identified two types of hemocyte (hyaline and granular) that showed significant variation in DHCs among sampling areas during the summer and winter. The apoptotic index only exhibited significant variation during the summer. Histopathological analysis results did not significantly differ among sampling areas. This work demonstrated that environmental variation (e.g., temperature and salinity) associated with anthropogenic actions may be affecting the immune system of yellow clams. However, more studies are needed to determine the full influence of these factors on the yellow clam's immune system and thus contribute to future management and aquaculture of the species. Received May 10, 2015; accepted October 28, 2015.

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Rickettsia-Associated Mortality of the Yellow ClamMesodesma mactroides(Bivalvia: Mesodesmatidae) in Southern Brazil

Cited by 18 publications

References 23 publications

Use of Polymerase Chain Reaction for Bivalve Pathogen Surveillance in the Yellow Clam Mesodesma mactroides

Use of Polymerase Chain Reaction for Bivalve Pathogen Surveillance in the Yellow Clam Mesodesma mactroides

First detection of gas bubble disease and Rickettsia‐like organisms in Paphies ventricosa, a New Zealand surf clam

Immunological Profile of the Yellow Clam Mesodesma mactroides (Mesodesmatidae) from the Southern Coast of Rio Grande do Sul, Brazil

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