Scientists Discover First Transmissible Cancer in North American Freshwater Fish

Scientists have identified the first known contagious cancer found in freshwater fish in North America. The discovery was made in a lake that straddles the border between the United States and Canada. The cancer is capable of spreading from one fish to another, a rare phenomenon in the animal kingdom. The affected species is a type of North American catfish. This finding marks a significant development in the study of transmissible cancers beyond previously known cases in mammals.
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