Contagious Cancer Spreading Among Catfish in New England Lake — A First in Fish

Fishers and biologists in Lake Memphremagog, New England, have been observing jet-black tumours on the skin of brown bullhead catfish for over a decade. Genetic testing now suggests the tumours are caused by the first contagious cancer ever documented in fish. The finding could have significant implications for understanding how cancers spread between animals.