Nodular gill disease
a unique form of proliferative gill disease in rainbow trout, Salmo gairdneri Richardson
Daoust, Pierre Y.Ferguson, H. W.
Journal of Fish Diseases
Pathology and Microbiology
In an outbreak of proliferative gill disease in laboratory rainbow trout fingerlings lesions were multifocal among filaments and uniquely severe in the distal region of affected filaments, forming nodules. This contrasted with the more common forms of proliferative gill disease in Ontario, such as bacterial gill disease, in which lesions are diffuse along and among filaments. The cause is unknown, although cells with a very distinctive morphology were closely associated with the lesions..