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Scientists Discover First Transmissible Cancer In Freshwater Fish

According to the study, researchers first noticed unusual black skin lesions on the catfish in 2013.

,   and  TIPP Staff
2 min read
Transmissible skin cancer discovered in freshwater fish in Canada and U.S. Pic via(@CTVNews)

Researchers have identified the world's first known transmissible cancer in freshwater fish, according to a study published in the journal Nature.

The melanoma affects brown bullhead catfish in Lake Memphremagog, which spans the border between Vermont and Quebec, and is believed to spread directly between fish rather than developing independently.

According to the study, researchers first noticed unusual black skin lesions on the catfish in 2013.

Genetic analysis later showed the tumors shared a common genetic lineage, indicating the cancer cells were being passed from one fish to another instead of arising separately in each animal.

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The report said the disease now affects about 30 percent of brown bullhead catfish in the lake and has also been detected in other lakes across New England. Scientists believe transmission may occur during spawning, when fish gather closely together.

Researchers plan laboratory experiments later this year to confirm how the cancer spreads. They said the discovery could improve understanding of how cancers spread within the body and potentially aid future human cancer research.

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