Scientists Saw Strange Spots on Local Fish. The Culprit Was Cancer That Spreads like an Infection.

Scientists Saw Strange Spots on Local Fish. The Culprit Was Cancer That Spreads like an Infection.

In 2012, anglers at Lake Memphremagog—on the border of Vermont and Quebec—found fish with strange black spots and lumps. A new study suggests it’s a rare form of transmissible melanoma.