Transmissible melanoma found in Lake Memphremagog catfish

Transmissible melanoma found in Lake Memphremagog catfish

Scientists at the University of Vermont reported that up to 37% of brown bullhead catfish sampled from Lake Memphremagog carried melanoma lesions, indicating a contagious cancer outbreak that may be tied to earlier flooding in the watershed. Earlier research had identified the disease as the first likely transmissible cancer in wild catfish, noting that the tumors share a common genetic origin. The findings, published in Nature, marked the first known transmissible cancer in a freshwater species.

Actors

Julie Dragon University of Vermont researchers

Locations

Lake Memphremagog, Quebec, Canada Lake Memphremagog, Vermont, United States University of Vermont, Burlington, Vermont, United States

Articles

July 28, 2026
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Transmissible melanoma found in catfish from Lake Memphremagog
Transmissible melanoma found in catfish from Lake Memphremagog

NewsNation • 28 Jul 22:33

Scientists report that up to 37% of brown bullhead catfish sampled in Lake Memphremagog carried melanoma lesions, suggesting a contagious cancer outbreak possibly linked to past flooding.

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July 25, 2026
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Researchers Identify First Likely Transmissible Cancer in Wild Catfish
Researchers Identify First Likely Transmissible Cancer in Wild Catfish

Yahoo • 25 Jul 18:57

A study of brown bullhead catfish in Lake Memphremagog found that melanoma tumors share a common genetic origin, suggesting the cancer may spread between fish, marking the first known transmissible cancer in a freshwater species.

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Researchers identify likely transmissible melanoma in wild brown bullhead catfish
Researchers identify likely transmissible melanoma in wild brown bullhead catfish

ABC News - Breaking News, Latest News and Videos • 25 Jul 18:33

A study published in Nature reports that melanoma cells appear to spread between brown bullhead catfish in Lake Memphremagog, marking the first known transmissible cancer in fish and in a freshwater environment.

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July 23, 2026
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Transmissible melanoma identified in brown bullhead catfish in Lake Memphremagog
Transmissible melanoma identified in brown bullhead catfish in Lake Memphremagog

FOX Weather • 23 Jul 19:13

Researchers have confirmed the first known case of a contagious cancer in freshwater fish, finding malignant melanomas in a significant portion of brown bullhead catfish in Lake Memphremagog.

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July 22, 2026
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Transmissible melanoma identified in catfish from Lake Memphremagog
Transmissible melanoma identified in catfish from Lake Memphremagog

NPR • 22 Jul 17:33

Scientists have discovered a contagious form of melanoma spreading among brown bullhead catfish in Lake Memphremagog, affecting about a third of the population and offering new insights into cancer metastasis.

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Scientists Identify First Transmissible Cancer in Freshwater Fish
Scientists Identify First Transmissible Cancer in Freshwater Fish

Gizmodo • 22 Jul 15:00

Researchers have confirmed that a melanoma-like tumor spreading among brown bullhead catfish in Lake Memphremagog is a contagious cancer, marking the first known transmissible cancer in a freshwater animal.

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