π German fish release becomes ecological threat in Spain
In 1974, a German fisherman released thousands of juvenile Wels catfish into Spain's Ebro River for sport fishing purposes. This introduced species has since become a dominant predator across many Spanish waterways. Five decades later, these fish are targeting endangered migratory species like Allis shad. Experts call the situation an βecological time bombβ because native ecosystems aren't prepared for such a large predator. Scientists predict the catfish will spread further upstream, potentially aided by climate change. π