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Histopathological and electron microscopical observations on rainbow trout fry syndrome
Author(s) -
Rangdale E.,
Richards R. H.,
Alderman D. J.
Publication year - 1999
Publication title -
veterinary record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.261
H-Index - 99
eISSN - 2042-7670
pISSN - 0042-4900
DOI - 10.1136/vr.144.10.251
Subject(s) - rainbow trout , spleen , biology , pathology , muscle hypertrophy , trout , zoology , inflammation , anatomy , fish <actinopterygii> , fishery , immunology , medicine , endocrinology
Rainbow trout ( Oncorhynchus mykiss ) fry and fingerlings with clinical signs of rainbow trout fry syndrome, and rainbow trout (0.5 to 3.5 g) with experimentally induced infections with Flavobacterium psychrophilum , were examined histopathologically and electron microscopically. Severe hypertrophy of the spleen and cellular degeneration were consistently observed. Distinctive features of the disease were the loss of definition of the splenic border and its replacement by a loosely structured eosinophilic layer, fibrinous inflammation and intercellular oedema within the spleen, and the presence of numerous filamentous bacteria interspersed throughout the organ.