From the Traverse City Record Eagle:

Great Lakes officials are trying to beat back the voracious Asian carp at the gates of Lake Michigan, while still wrangling with another nasty invader that snuck in at least 90 years ago.

Sea lampreys, eel-like parasitic fish native to the Atlantic Ocean, use a mouthful of teeth and a bony tongue to latch onto and scrape through fish flesh.

Scientists debate whether the lamprey is native to Lake Ontario, where it was discovered in 1835. But it invaded Lake Erie by 1921 and spread throughout the Great Lakes, reaching Lake Superior in 1938, according to the Department of Natural Resources.

Now researchers have new insights on a pesticide used against lampreys for 60 years. Their findings could help fishery managers kill more lampreys with less money and less poison in Great Lakes streams. Read more.