Transmissible Cancer Discovered in Catfish.

Transmissible cancer affecting brown bullhead catfish in North American lakes is the first such case identified in fish, with black splotches indicating disease presence.

• Why it matters: Understanding this transmissible cancer is crucial because it reveals a new form of disease transmission in aquatic ecosystems and could shed light on cancer mechanisms applicable to other species, including humans.
• What they did: Researchers examined brown bullhead catfish exhibiting black splotches in lakes across New England and Canada, identifying the likely presence of a transmissible cancer through observational and diagnostic methods.
• The result: This discovery opens avenues for studying cancer transmission in aquatic animals and may help assess the prevalence and impact of similar diseases in other fish populations and environments.