According to the Great Lakes Echo, there are 39 "high-risk invasive species" and 10 of them could potentially cause a huge environmental impact in the Great Lakes. Among them are the snakehead, pictured here, which is already causing problems in the mid-Atlantic. Also the inland silverside, which could outcompete native fish for plankton, and two aquatic vegetation species, Cuban bulrush and marsh dewflower.
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Check out all the GoFISHn updates about Asian carp.