sea lamprey

MARQUETTE COUNTY, MI--   The U.S. Fish and Wildlife Service is applying chemicals to the Little Garlic River in Marquette County to kill sea lamprey. 

The lampricide kills lamprey larvae, which live in Great Lakes streams and tributaries then migrate to the lakes and kill fish. Infested streams must be treated every three to five years to control lamprey populations.

TRAVERSE CITY, MI (AP)--   Federal scientists have made a potentially important discovery about the invasive sea lamprey, a longtime enemy of Great Lakes fish.  

Experiments show the rate at which lampreys grow from larvae to adults may help determine whether they'll be male or female.

Scientists say lampreys appear to grow more slowly in waterways with poor food supplies. Lampreys spawned there are more likely to be males than those spawned in environments with plentiful food, where they grow faster.

ANN ARBOR, MI (AP)--   For the first time, the U.S. Environmental Protection Agency has approved a synthetic sexual lure to help capture sea lampreys in the Great Lakes.  

Lampreys are eel-like creatures that invaded the lakes in the last century and severely depleted populations of trout and other native fish. They use suction-cup mouths and razor-sharp teeth to fasten themselves to their prey and suck out body fluids.

TRAVERSE CITY, MI (AP)--   Officials are reporting significant progress in the battle against an invasive, fish-killing Great Lakes parasite.  

The Great Lakes Fishery Commission says Wednesday the population of sea lampreys has reached a 30-year low in Lake Huron and a 20-year low in Lake Michigan. Numbers also are down in the other lakes, although they remain above target levels in Lakes Superior and Erie.

Tool studies effect of dams on lampreys

May 4, 2015

LANSING, MI (AP)--   A newly developed online tool is designed to shed light on how removing dams on rivers in the Great Lakes region would affect the invasive sea lamprey. 

Sea lampreys are eel-like predators that attack other fish. They devastated lake trout and other prized species after reaching the Great Lakes through shipping canals in the last century.

Dams have blocked the lamprey's path on some rivers and streams. But many of the structures are crumbling with age, and removing dams to allow free flow of waterways is increasingly popular.

MANISTIQUE, MI--   The state of Michigan is taking ownership of a new barrier on the Manistique River designed to block the path of parasitic sea lampreys.

Deterioration of a century-old dam is giving the lampreys access to the river, where they spawn and launch invasions of Lake Michigan. Lampreys fasten themselves to fish and feed on their body fluids, sometimes killing the hosts.

The Manistique River now produces more lampreys than any other Lake Michigan tributary.