Contagious cancer in brown bullhead catfish
Quick dive
- The study examined brown bullhead catfish from Lake Memphremagog.
- About 30% of catfish collected from across the lake since 2013 had melanoma.
- Tumour mitochondrial DNA showed far more mutations than normal tissue, supporting an external origin.
- Researchers found no unique virus or other microbial agent in screened tumour and normal tissues.
- exam_relevance: tests the distinction between infectious disease and transmissible cancer, mitochondrial DNA evidence, immune rejection and aquatic transmission using the article’s unusually specific fourth documented instance.
Full explanation
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