Sporadic neoplasms of farmed chinook salmon, Oncorhynchus tshawytscha (Walbaum), from New Zealand.

Eight separate neoplasms with five distinct morphologies are described in the present report. The spontaneous neoplasms were identified in farmed chinook salmon, Oncorhynchus tshawytscha (Walbaum), during processing. The masses were examined histologically and were classified as teratoma, rhabdosarcoma, biliary and renal cystadenomas, renal carcinoma and three leiomyomas. This represents one neoplasm detected for every 125000 fish processed during the sampling period.