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Scanning and transmission electron microscopical observations on Hexamita salmonis (Moore, 1922) related to mortalities in rainbow trout fry Salmo gairdneri Richardson
Author(s) -
FERGUSON H. W.
Publication year - 1979
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.1365-2761.1979.tb00140.x
Subject(s) - biology , rainbow trout , salmo , parasite hosting , ultrastructure , epithelium , zoology , giardia lamblia , brush border , anatomy , fish <actinopterygii> , microbiology and biotechnology , fishery , genetics , computer science , vesicle , membrane , world wide web
. Examination of the digestive tract of rainbow trout fry infected with Hexamita salmonis revealed no pathological changes in the epithelial cells of the pyloric caeca or upper intestine even where the parasites were closely apposed to the brush border of these cells. No invasion of the epithelium by the parasites was observed, although examples of shrinkage necrosis (apoptotic bodies) of epithelial cells were often found. The ultrastructure of the parasite resembled that of the closely related Giardia lamblia . Despite the lack of pathological changes to the intestinal epithelium, treatment of the fish to remove the parasites greatly reduced mortalities.