DAO 31:49-54 (1997)  -  doi:10.3354/dao031049

Granulomatous myositis in rainbow trout Oncorhynchus mykiss affected by proliferative kidney disease (PKD)

D. Fernández-de-Luco*, M. A. Peribáñez, L. García, J. A. Castillo

Departamento de Patología Animal, Facultad de Veterinaria, C/ Miguel Servet 177, E-50.013 Zaragoza, Spain

A hatchery for brown (Salmo trutta) and rainbow (Oncorhynchus mykiss) trout has been repeatedly affected by proliferative kidney disease in summer. Rainbow trout was the only species affected, showing lesions principally in the kidney and in the red muscle of both lateral lines. Grossly, fish had protuberances in the kidney and on the skin surface corresponding to granulomatous inflammation of the kidney and of the red muscle, respectively. PKX cells were observed in granulomatous tissues of both muscle and kidney and were composed of macrophages, lymphocytes and plasma cells. Using lectin GS-I, extrasporogonic stages of myxosporean PKX cells were recognized in the kidney and muscle.


PKD · Rainbow trout · Oncorhynchus mykiss · Granulomatous myositis


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