Occurrence of Perkinsus olseni (Protozoa: Apicomplexa) and other parasites in the venerid commercial clam Pitar rostrata from Uruguay, southwestern Atlantic coast

Cremonte, Florencia; Balseiro, Pablo; Figueras, Antonio

doi:10.3354/dao064085

Cited by 51 publications

(34 citation statements)

References 23 publications

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“…Bower et al (1994) stated that occurrences of RLOs are generally of low intensity and their presence is not associated with disease. However, other studies have indicated more severe effects, such as rupturing of the digestive tubules, which contain larger colonies (CREMONTE et al, 2005). Villalba et al (1999) found high prevalence of RLOs in mollusks, with an inflammatory reaction and disorganization of gill architecture, which possibly undermines gill function and suggests that these bacteria may be responsible for mortalities in Venerupis rhomboides.…”

Section: Discussionmentioning

confidence: 99%

“…has frequently been recorded in C. rhizophorae. Similarly to polychaetes, this parasite has been reported not to cause significant damage to its host's health (NASCIMENTO et al, 1986;BOWER et al, 1994;AZEVEDO & MATOS, 1999;WINSTEAD et al, 2004;CREMONTE et al, 2005;SABRY et al, 2007;ZEIDAN et al, 2012). However, the gill functions of host animals, which are severely infected by these gregarines, may be compromised (CARBALLAL et al, 2001;ESTEPA, 2006).…”

Section: Discussionmentioning

confidence: 99%

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Parasites in the mangrove oyster Crassostrea rhizophorae cultivated in the estuary of the Graciosa River in Taperoá, Bahia

Cova

Júnior

Boehs

et al. 2015

Rev. Bras. Parasitol. Vet.

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Parasites in the mangrove oyster Crassostrea rhizophorae cultivated in the estuary of the Graciosa River in Taperoá, BahiaParasitos na ostra-do-mangue Crassostrea rhizophorae cultivada no estuário do rio Graciosa em Taperoá, Bahia AbstractIn this work, parasites associated with the mangrove oyster Crassostrea rhizophorae were studied at a cultivation unit in the estuary of the Graciosa River in Taperoá, Bahia. On a monthly basis, between April 2011 and March 2012, 20 oysters were collected, measured and fixed in 10% formaldehyde. In order to identify the parasites, routine histological techniques were used. The specimens were embedded in paraffin and sections, 7 µm thick, were cut. These were then stained with Harris hematoxylin and eosin and were examined using an optical microscope. The parameters analyzed to investigate water quality showed that the temperature ranged from 23.9 °C to 29.3 °C, water salinity from 0.4 to 24.2 Practical Salinity Units PSU and recorded rainfall from 80 mm to 406.4 mm/month. During the parasitological analyses, infestation of the polychaete Neanthes succinea was observed in 41% of the oysters. Through histological techniques, the following parasites were identified: colonies of Rickettsia-like organisms (RLOs); the protozoa Nematopsis sp. and Ancistrocoma sp.; the turbellarian Urastoma sp.; the metacestode Tylocephalum sp. and an unidentified tapeworm. The data collected showed that there was low-intensity infection with and prevalence of parasites, except for Nematopsis sp., thus attesting that these cultivated oysters were in a healthy condition.Keywords: Histology, protozoa, Nematopsis sp., Neanthes succinea, bivalves. ResumoNo presente trabalho, parasitos associados à ostra-do-mangue Crassostrea rhizophorae foram estudados em uma unidade de cultivo no estuário do rio Graciosa em Taperoá, Bahia. Mensalmente, entre abril de 2011 e março de 2012, 20 ostras foram coletadas, mensuradas e fixadas em formol a 10%. Para a identificação dos parasitos, foram utilizadas técnicas histológicas de rotina, com inclusão em parafina e obtenção de cortes com 7µm, corados com hematoxilina de Harris e eosina e examinados em microscopia de luz. Os parâmetros analisados para a qualidade da água mostraram que a temperatura variou de 23,9 °C a 29,3 °C, a salinidade de 0,4 a 24,2 PSU e a pluviometria de 80 mm a 406,4 mm/mês. Nas análises parasitológicas foram observadas infestações do poliqueta Neanthes succinea em 41% das ostras. A partir das técnicas histológicas foram identificados os seguintes parasitos: colônias de organismos assemelhados a Rickettsiae (RLOs); os protozoários Nematopsis sp. e Ancistrocoma sp.; o turbelário Urastoma sp.; o metacestóide Tylocephalum sp. e um platelminto não identificado. Os dados obtidos mostraram baixa intensidade de infecção e prevalência de parasitos, exceto para Nematopsis sp., atestando a boa condição de saúde das ostras no cultivo.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Parasites in the mangrove oyster Crassostrea rhizophorae cultivated in the estuary of the Graciosa River in Taperoá, Bahia

Cova

Júnior

Boehs

et al. 2015

Rev. Bras. Parasitol. Vet.

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“…Lima et al (2001) and Winstead et al (2004) verified the absence of pathologic processes linked to Nematopsis presence in the mussel Perna perna and in the oyster C. virginica, respectively. Cremonte et al (2005) relate also the absence of host response to parasitism by Nematopsis in the gut epithelial cells of Pitar rostrata. Nascimento et al (1986), observed equally with this study, high prevalence of Nematopsis in oysters C. rhizophorae from Bahia State, Brazil, but it had very low to moderate levels of infection.…”

Section: Discussionmentioning

confidence: 99%

“…In South America, there is not enough knowledge about health status and parasites of bivalves (Bower et al, 1994). According to Cremonte et al (2005), this occurs because the mollusks' rearing is poorly developed in the coasts of South Western Atlantic. In Brazil, studies on mollusk diseases are recent and scarce.…”

Section: Introductionmentioning

confidence: 99%

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First record of parasitism in the mangrove oyster Crassostrea rhizophorae (Bivalvia: Ostreidae) at Jaguaribe River estuary - Ceará, Brazil

2007

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Mangrove oysters Crassostrea rhizophorae were sampled monthly in the estuary of Jaguaribe River, on the east coast of Ceará State, Brazil, between August, 2000 and December, 2001, making up 170 individuals. The water temperature varied from 26 to 30 °C and salinity from 21 to 42‰. The animals' size ranged from 3.4 to 7.2 cm height. Macroscopical and histopathological analyses were carried out in the oysters' tissues. The histological exams showed protozoans and metazoans of genera Nematopsis and Tylocephalum, respectively. Nematopsis prevalence varied from 60 to 100% and it was higher in the gills and mantle. The oocysts presented a mean size of 11.5 µm (±1.32) length and 9.1 µm (±1.06) width (n = 30), up to 3 oocysts/phagocyte having been observed. Several animals presented focal hemocitical reaction.

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Parasitic Endosymbiosis

Ciancio¹

2016

Invertebrate Bacteriology

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Occurrence of Perkinsus olseni (Protozoa: Apicomplexa) and other parasites in the venerid commercial clam Pitar rostrata from Uruguay, southwestern Atlantic coast

Cited by 51 publications

References 23 publications

Parasites in the mangrove oyster Crassostrea rhizophorae cultivated in the estuary of the Graciosa River in Taperoá, Bahia

Parasites in the mangrove oyster Crassostrea rhizophorae cultivated in the estuary of the Graciosa River in Taperoá, Bahia

First record of parasitism in the mangrove oyster Crassostrea rhizophorae (Bivalvia: Ostreidae) at Jaguaribe River estuary - Ceará, Brazil

Parasitic Endosymbiosis

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