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Ultrastructural aspects of infestation by Ichthyobodo necator (Henneguy, 1883) on the skin and gills of the salmonids Salmo salar L. and Salmo gairdneri Richardson
Author(s) -
ROUBAL F. R.,
BULLOCK A. M.,
ROBERTSON D. A.,
ROBERTS R. J.
Publication year - 1987
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.1365-2761.1987.tb01060.x
Subject(s) - salmo , spongiosis , biology , ultrastructure , cytoplasm , gill , infestation , zoology , fish <actinopterygii> , anatomy , fishery , botany , microbiology and biotechnology , immunology
. Ultrastructural changes in the skin and gill epithelia of Salmo salar L. and Salmo gairdneri Richardson caused by Ichthyobodo necator are described. Sloughing of Malphigian cells and epidermal spongiosis result in the characteristic clinical signs of costiasis. Destruction of subsurface cells may facilitate rapid development of spongiosis. Infested surface cells show dramatic degeneration of the cytoplasm but the nucleus usually remains intact. It is concluded that I. necator does not feed specifically on the nucleus.