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Some observations of rainbow trout, Salmo gairdneri , Richardson, infected with Cryptobia salmositica
Author(s) -
LoweJinde L.
Publication year - 1979
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1979.tb03522.x
Subject(s) - rainbow trout , salmo , biology , gill , cryptobiosis , asymptomatic , spleen , anatomy , microbiology and biotechnology , fish <actinopterygii> , fishery , medicine , immunology , ecology , desiccation
Rainbow trout ( Salmo gairdneri ) were infected with an inoculum of infected blood containing 10 6 Cryptobia salmositica. Parasitaemia was cyclical with a major peak at 14–21 days and a smaller peak at 42 days. The first peak of parasitaemia was correlated with low glucose, plasma proteins, and haematocrit levels. During this time clinical symptoms (exophthalmia, ascites, pale liver and gills) of the pathogenic condition were observed. The partial disappearance of the parasites from the blood was corrrelated with their appearance in the peritoneal cavity. As plasma glucose, proteins, and haematocrit levels returned towards control values, the oedema and gill paleness declined. Examination of the liver and spleen showed an exudate of fibrous matrix on their exterior surfaces. In addition, the presence of 2–4×10 3 mm −3 Cryptobia in asymptomatic surviving fish suggests that a chronic parasitaemia can be tolerated.