Contagious Cancer Found in North American Catfish

Researchers have discovered a transmissible melanoma in brown catfish in Lake Memphremagog, marking the first documented case of contagious cancer in a freshwater fish species. Genetic analysis revealed that the tumors share a common identity, suggesting the cancer spreads between individuals.
An international team of researchers has identified a transmissible melanoma in the brown catfish (Ameiurus nebulosus)—the first documented case in fish and also the first recorded in a freshwater ecosystem. Their findings were reported this month in the journal Nature.
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