Scientists uncovered a shocking twist in freshwater ecology: a transmissible melanoma spreading among catfish, with genetically identical tumors proving it’s contagious—not random. First spotted in Lake Memphremagog in 2012, the cancer, linked to arsenic-rich environments and spawning behavior, defies typical cancer biology. No viruses or bacteria involved—just rogue cancer cells passing from fish to fish. Researchers warn: don’t eat the ones with tumors.
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