Origins of cancer in freshwater fish
A recent scientific study has revealed a rare discovery of a transmissible skin cancer in Brown Bullhead Catfish found in Lake Memphremagog, located on the border between Vermont, USA, and Quebec, Canada. This cancer was first observed back in 2012, when fishermen noticed black spots and swellings on the fish's bodies. Genetic analyses showed that the tumors were interconnected in a way that indicates direct transmission from one fish to another. This is the first known case of its kind in freshwater fish and demonstrates how cancer cells can cross biological barriers and transfer between individuals, potentially living as parasites. This finding opens new horizons for understanding the mechanisms of cancer spread. Currently, there is no evidence suggesting that the disease can be transmitted to humans. Environmental factors, such as pollution, are suspected to play an indirect role in the spread, highlighting the importance of monitoring the health of aquatic ecosystems to assess how environmental changes might impact the organisms living within them.
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