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Citation

Rangdale RE, Richards R & Alderman DJ (1999) Histopathological and electron microscopical observations on rainbow trout fry syndrome. Veterinary Record, 144 (10), pp. 251-254. https://doi.org/10.1136/vr.144.10.251

Abstract
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.

Journal
Veterinary Record: Volume 144, Issue 10