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Crayfish Invasion Threatens Grand Canyon | Mesa News
Crayfish are invading the Colorado River below Glen Canyon Dam in record numbers—over 3,000 caught this year alone, up from just 2 dozen last year. These voracious invaders feast on plants, fish eggs, and even snakes, thriving thanks to warmer dam-release water that’s also aiding invasive fish while harming native species. Already dominating rivers in Arizona and Utah, they’re poised to march into the Grand Canyon, threatening the last pristine Western streams. With cold-water releases halted for power needs, officials are scrambling with electrofishing, chemical treatments, trapping, and…
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