In 1974, a German fisherman released thousands of baby catfish into a Spanish river; 50 years later they are threatening native wildlife as an ‘ecological time bomb’
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August 7, 2026
German biologist and recreational fisherman Roland Lorkowsky released thousands of juvenile Wels catfish into Spain’s Ebro River in 1974. His goal was simple and positive: to create a world-class sport fishery by introducing one of Europe’s…