An unusual cancer affecting catfish in Lake Memphremagog has been drawing attention from scientists and wildlife officials for years. The lake, which stretches across northern Vermont and Quebec, is surveyed annually by the Vermont Fish & Wildlife Department, and the problem first stood out during that routine monitoring in 2013.
What makes the case especially notable is the suggestion that the disease may be transmissible. Instead of appearing only as isolated tumors in individual fish, the cancer seems to be spreading through a population of catfish in a way that researchers consider highly unusual.
The discovery has turned a regional fish health mystery into a broader scientific question. Transmissible cancers are rare, and studying one in a wild lake population could help researchers better understand how cancer cells move, survive and establish themselves in new hosts.
Beyond the immediate concern for fish in Lake Memphremagog, the findings may also offer clues about metastasis, the process by which tumors spread. That link is why a strange disease in a border lake has become a case of interest well beyond fisheries science.
