Histopathology of four spontaneous neoplasms in three species of salmonid fishes*

Abstract

Abstract. Gross and histological descriptions of four different spontaneous neoplasms in three species of salmonid fishes are provided: thymic lymphoma and dermal fibrosarcoma, respectively, in two artificially reared sockeye salmon, Oncorhynchus nerka (Walbaum); renal papilliferous cystadenoma in a wild caught chinook salmon, O. tshawytscha (Walbaum); capillary haemangioma of the dermis in an artificially reared rainbow trout, Salmo gairdneri Richardson. The frequency of occurrence of these and related tumour types, as reported in the literature, are compared in salmonid and non‐salmonid fish.