Scientists uncovered a shocking discovery in Lake Memphremagog: a transmissible cancer spreading among brown bullhead catfish, marking the first known case of such a disease jumping between freshwater fish. With melanoma lesions affecting up to 37% of sampled fish, researchers suspect environmental factors — possibly linked to the 2011 flood — may be driving the outbreak. Genetic analysis confirmed the cancer’s cells are genetically identical across different fish, a hallmark of contagious cancers seen only in dogs, Tasmanian devils, and shellfish. While the exact transmission method remains unclear, scientists are investigating reproductive habits and aging as potential vectors. Given the lake supplies drinking water to over 175,000 people, understanding this evolving threat is critical.
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