FLOW Aquatic Invasive Species Program coordinator Derek Thorn removes a clump of invasive European frog-bit from Peshtigo Harbor in Peshtigo, Wisconsin on August 2, 2023. European frog-bit, first detected in Green Bay's coastal wetlands in the summer of 2021, forms dense mats on the water's surface, threatening the habitats of native flora and fauna. For USA TODAY NETWORK-Wisconsin.
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