Tuesday, June 12th
Researchers from the United States Geological Survey check the levels of lamprey pheromone in traps being used as a part of a study on the Grand River on Monday, May 7, 2018. The study being conducted will provide estimates of the lamprey population in the Grand River and be a deciding factor in whether a "lampricide", the killing of lampreys, must be done. The teeth of a lamprey can be seen with it's mouth open. The U.S. Fish and Wildlife Service wants to find out how many sea lampreys are in the Detroit River and other area waterways. A crew is expected to do an assessment from May 29 to June 7 that will help determine the need for measures to control the eel-like parasites, which attack fish such as trout, salmon and whitefish. (Henry Taylor/The Grand Rapids Press via AP)