Perkinsus sp. (Phylum Apicomplexa) in Mediterranean clam Ruditapes semidecussatus: ultrastructural observations of the cellular response of the host

An infection caused by a Perkinsus sp. was observed in Ruditapes semidecussatus collected on the western Mediterranean coast (Tarragona, Spain). The trophozoites were generally grouped and surrounded by amorphous material that constituted a nodule. These nodule reactions with trophozoites were locat...

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Bibliographic Details
Published in:Aquaculture 1995-01, Vol.132 (1), p.153-160
Main Authors: Sagristá, E., Durfort, M., Azevedo, C.
Format: Article
Language:English
Subjects:
ALMEJAS
Animal aquaculture
Animal productions
Apicomplexa
Aquaculture
Biological and medical sciences
BLOOD CELLS
Cellular biology
CELLULE SANGUINE
CELULAS SANGUINEAS
CLAM
CLAMS
Fundamental and applied biological sciences. Psychology
Hemocytes
HOSTS
HOTE
HUESPEDES
Invertebrate aquaculture
Marine
Mollusca
Mollusks
Parasite — encapsulation
Perkinsus
Perkinsus sp
Ruditapes semidecussatus
SPOROZOA
ULTRAESTRUCTURA
ULTRASTRUCTURE
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Summary:An infection caused by a Perkinsus sp. was observed in Ruditapes semidecussatus collected on the western Mediterranean coast (Tarragona, Spain). The trophozoites were generally grouped and surrounded by amorphous material that constituted a nodule. These nodule reactions with trophozoites were located in connective tissue of the gut, hepatopancreas, kidney, gonads, mantle, and gill. Ultrastructural features of the host reaction due to the presence of Perkinsus sp. are described. A large number of hemocytes was present in infested clams. These hemocytes present numerous eosinophilic and metachromatic granules of varying size, some coalescing into megagranules which contain Thièry-positive membrane remains in the interior. Single trophozoites are sometimes located in these cells. Ultrastructural data show that the lysis of the hemocytes and the coalescence of the granules result in the nodule that encapsulates various trophozoites.
ISSN:0044-8486
1873-5622
DOI:10.1016/0044-8486(94)00391-Z