In 1974, a Spainish rancher imported 2,000 kg of American crayfish from Louisiana. 50 years later, it has become an invasion nobody could stop

An American red swamp crayfish invasion reshaped Spain's Guadalquivir River basin and Doñana National Park. This destructive biological invasion decimated native wildlife and altered the region's delicate ecology. However, the species also fostered a multimillion-euro seafood business for local communities. This industry now supplies crayfish to Sweden and Finland, filling a market gap. Spain now balances environmental damage control with its reliance on this invasive animal.

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