期刊
JOURNAL OF INVERTEBRATE PATHOLOGY
卷 78, 期 2, 页码 87-97出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/jipa.2001.5049
关键词
Cerastoderma edule; disseminated neoplasia; gregarine; trematode; turbellarian; coccidian; ciliates; copepods; haplosporidian; microsporidian
类别
A survey of pathological conditions affecting cockle populations of the most economically important natural beds of Galician estuaries in NW Spain was performed. Samples of 30 adult cockles were collected from each of 34 natural beds in the spring of 1999 and processed by histological techniques. Disseminated neoplasia were seen in samples from most of the natural beds, in some cases with a high prevalence. The gregarine Nematopsis sp., larval trematode stages, and branchial extracellular large cysts enclosing bacteria-like microorganisms were the most prevalent parasites. Paravortex cardii, intracellular colonies of rickettsiae-like organisms in digestive and gill epithelium Pseudoklossia sp. coccidians, Trichodina sp., an other ciliates were frequently seen in the samples. Copepods in gills and intestine and unidentified gregarines in intestine epithelia and surrounding connective tissue were less prevalent and were observed in samples of some natural beds. Large foci of heavy hemocytic infiltration were detected in a few sites only. Cysts of Steinhausia sp. and plasmodia and spores of a haplosporidian were seen in cockles from two localities. Inflammation was frequently observed in the samples. Some of the parasites and pathological conditions could be associated with mortality. (C) 2001 Academic Press.
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