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DAO 64:85-90 (2005)
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Abstract
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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
Florencia Cremonte1,*, Pablo Balseiro2, Antonio Figueras2
1Centro Nacional Patagónico (CONICET), Boulevard Brown s/nº, 9120 Puerto Madryn, Chubut, Argentina
2Instituto de Investigaciones Marinas (CSIC), Eduardo Cabello 6, 36208 Vigo, Spain
*Email: fcremont@cenpat.edu.ar
ABSTRACT: A study was conducted into the health status of natural populations of the venerid clam Pitar rostrata from Uruguay. Perkinsus sp. was detected in 22% of the clams. Severe hemocytic infiltration was detected in the tissues
parasitized by this protozoan parasite. The sequencing of the ITS-5.8S gene cluster of the parasite confirmed that it belonged to the Perkinsus olseni species. Rickettsia or Chlamidia-like organisms were also found, with a prevalence of 11%,
although without apparent host reaction; an unidentified species of Coccidia was found in the nephridia of 78% of the clams, with the intensity of infection ranging from moderate to high. A gregarine, Nematopsis-like organism was observed mainly in
the epithelial cells of the intestine, without host response and with a prevalence of 56%. Of the metazoan parasites, trematodes were found in 11% of the individuals analyzed.
KEY WORDS: Perkinsus olseni · Pathology · Pitar rostrata · Venerid clam · Southwestern Atlantic coast
Full text in pdf format
Published in DAO Vol.
64, No. 1
(2005) on April 6
Print ISSN: 0177-5103; Online ISSN: 1616-1580.
Copyright © Inter-Research, Oldendorf/Luhe, 2005
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