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The developmental cycle of epitheliocystis in carp, Cyprinus carpio L.
Author(s) -
PAPERNA I.,
ALVES DEMATOS A. P.
Publication year - 1984
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1111/j.1365-2761.1984.tb00916.x
Subject(s) - cyprinus , carp , gill , biology , ultrastructure , mucus , common carp , fish <actinopterygii> , anatomy , andrology , microbiology and biotechnology , fishery , ecology , medicine
. Epitheliocystis infections in the gills of carp from Israel and Portugal occurred in lining epithelial cells as well as mucus and chloride cells. Ultrastructural studies of infected cells revealed several morphological forms of epitheliocystis showing the existence of a pleomorphic developmental cycle. The following stages were observed: chlamydia‐like round cells (RC), non‐dividing round cells (NRC) and bullet‐shaped small cells (SC). All these were identical in shape to RC and SC described from epitheliocystis of other fish, The rickettsia‐like cells (PLC and ILC) which occur in epitheliocystis from other fish species and produce the SC were absent in carp epitheliocystis and instead the RC were seen transforming into SC. Transformation to SC, however, occurred at any stage of the developmental process, even before the replication potential of the RC was exhausted, i.e. before reaching the NRC stage.