The continuing battle against sea lampreys soon will come to locations in the local area. A U.S. Fish and Wildlife Service survey crew will conduct work on the offshore area near the Portage River in Ottawa and Sandusky Counties during August 17-20 to search for the presence of lampreys near the mouth of the stream. The information gathered will be used to determine if sea lampreys have established themselves in the system.
A first step in the control of sea lampreys is to survey streams tributary to the Great Lakes to determine the presence of lamprey larvae. Sea lampreys invaded the Great Lakes during the 1920s and have been a permanent, destructive element of the fishery ever since. Sea lampreys attach to fish with a suction cup mouth, rasp a hole though the fish’s scales and skin, and feed on blood and body fluids. The average sea lamprey will destroy up to (40 lbs/ 20 kg) of fish during its parasitic phase.