Researchers Investigated Transmissible Fish Cancer Spread
Scientists are tracking whether a specific skin cancer found in catfish has moved into new regional waters.
Updated on Oct. 6, 2026 in Cancer
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University of Cambridge researchers have launched an investigation to determine if a transmissible skin cancer affecting brown bullhead catfish has spread to Nova Scotia and New Brunswick. Anglers are being asked to report fish displaying dark spots or lumps to assist in this ongoing study.
Why it matters
Researchers are working to establish whether fish populations across unconnected bodies of water share the same genetic transmissible cancer. This study helps track the movement and prevalence of the condition in wild fish populations after it was first identified nearly 15 years ago.
A 2026 University of Vermont study confirmed that melanoma found on brown bullhead catfish is transmissible. Previous research conducted between 2014 and 2018 had already identified the dark spots and lumps on the fish as confirmed cases of skin cancer.
The players
University of Cambridge
A global academic institution currently leading the investigation into the transmission of fish cancer.
University of Vermont
An academic institution that provided the 2026 study confirming the transmissibility of the fish melanoma.
Nova Scotia Museum of Natural History
A provincial institution managing the collection of fish specimens from local anglers.
The details
The condition is believed to spread through physical contact, potentially when fish strike one another using their sharp, spiny dorsal or pectoral fins. Researchers are investigating if the same strain of transmissible cancer documented in Lake Memphremagog is present in Atlantic Canada. There is no evidence suggesting that this form of cancer poses a risk to human health.
Timeline
2011: The cancer was first identified in Lake Memphremagog.
2014-2018: Studies confirmed the fish spots were skin cancer.
2026: A University of Vermont study identified the melanoma as transmissible.
Summer 2026: Researchers conducted an evidence search in New Brunswick.
Health Landscape
This investigation builds upon the 2026 University of Vermont catfish melanoma study by extending the geographic scope of surveillance. It reflects an effort to track the spread of specific transmissible conditions within wild populations using established genetic evidence.
There is no evidence that this fish cancer can spread to humans or impact public health. Anglers who catch fish with visible dark spots or lumps should follow local guidance by freezing the specimens and contacting the Nova Scotia Museum of Natural History.
The takeaway
While this condition is significant for wild fish populations, it does not pose a threat to human health. Always practice standard safety precautions when handling wildlife and follow instructions from local biological experts if you encounter fish with visible signs of disease.
Further reading
For broader insights on oncological research, visit Cancer.
Source note: This article includes information reported by Toronto Sun.
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