A team of Vermont researchers has discovered that mysterious black skin lesions afflicting catfish in Lake Memphremagog and other New England and Canadian lakes are caused by a transmissible cancer—the first identified in a freshwater fish species. The cancer cells behave more like parasites tha...

Source: [Phys.org](https://phys.org/news/2026-07-transmissible-cancer-cells-fish-parasites.html)

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