DAO 62:177-180 (2004)  -  doi:10.3354/dao062177

Streptococcus iniae type II infections in rainbow trout Oncorhynchus mykiss

D. Lahav1, M. Eyngor2, A. Hurvitz3, C. Ghittino4, A. Lublin2, A. Eldar2,*

1Department of Pathology, and 2Department of Poultry and Fish Diseases, Kimron Veterinary Institute,POB 12, 50250 Bet-Dagan, Israel
3Dan Fish Farm, Kibbutz Dan, 12245 Upper Galilee, Israel
4Department of Fish Pathology, IZS–State Veterinary Institute, 06126 Perugia, Italy
*Corresponding author. Email:

ABSTRACT: Clinical and pathological findings (anorexia, hemorrhage, lethargy, loss of orientation and exophthalmia) indicated that Streptococcus iniae type II is responsible for a fatal disease in rainbow trout. Histopathological findings revealed that S. iniae type II produces a systemic disease, including a diffuse necrotizing myositis. The distribution of viable bacteria in infected tissues substantiated the pathological findings, confirming that S. iniae type II is responsible for a generalized septic disease of rainbow trout.


KEY WORDS: Rainbow trout · Streptococcus iniae · Serotype · Pathology


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Published in DAO Vol. 62, No. 1-2. Online publication date: November 23, 2004
Print ISSN: 0177-5103; Online ISSN: 1616-1580
Copyright © 2004 Inter-Research.