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USGS photograph of a brown bullhead catfish from Lake Memphremagog with raised black malignant melanoma lesions — Photo: Vicki S. Blazer / U.S. Geological Survey, public domain; cropped and colour balanced

World Explained · Animal biology

Catfish can catch cancer from one another. Here is how scientists know

A new genomic study found that melanomas in different brown bullhead catfish belong to one living cancer lineage. The cells, not a virus, appear to spread.

24 July 2026 · 12 min readRead story →

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