How four fish imported to clean ponds became one of America's biggest invasive species problems

In the 1970s, wildlife and aquaculture managers in the southern United States imported four species of carp from Asia, bighead, silver, grass and black carp, intending to use them as a natural, low-cost way to control excess algae, aquatic weeds and snails in fish farm ponds and wastewater treatment facilities. Within about a decade, flooding allowed a number of these fish to escape confinement and enter the Mississippi River basin.

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