Sea lamprey up in Lake Superior

August 27, 2005

The number of sea lamprey has nearly doubled in western Lake Superior in the past year, according to Minnesota and U.S. wildlife officials.

The eel-like, blood-sucking, fish-killing sea lamprey is becoming a problem across Lake Superior, according to Jessica Richards, U.S. Fish and Wildlife Service marine biologist in Marquette, Mich.

"The agency's overall sea lamprey population estimates jumped 23 percent from 2004 to 2005," she said.

Not only is the number of lamprey up, but the scars they leave on fish are up as well. Sea lamprey scars on big lake trout were up more than 400 percent -- 26.9 scars per 100 trout compared to 6.4 per 100 trout last year, reported the St. Paul (Minn.) Pioneer Press Friday.

So far, the spike in the invasive species hasn't reduced lake trout numbers, but that could change quickly if lampreys aren't brought back under control, state officials said.

Copyright 2005 by United Press International

Explore further: Researcher studies vampiric silver lamprey

Related Stories

Scents latest weapons in fight against sea lamprey

January 2, 2011

(AP) -- In the never-ending battle to prevent blood-sucking sea lamprey from wiping out some of the most popular fish species in the Great Lakes, biologists are developing new weapons that exploit three certainties in the ...

Science vs. the sea lamprey

February 21, 2017

Of all the fishy predators in the Great Lakes, few are more destructive than the sea lamprey. There's something of a horror movie in their approach: jawless, they attach to prey such as salmon, whitefish or trout with a sucker ...

Masses of plastic particles found in Great Lakes

July 30, 2013

Already ravaged by toxic algae, invasive mussels and industrial pollution, North America's Great Lakes now confront another potential threat that few had even imagined until recently: untold millions of plastic litter bits, ...

Recommended for you

Strain-free epitaxy of germanium film on mica

November 17, 2017

Germanium, an elemental semiconductor, was the material of choice in the early history of electronic devices, before it was largely replaced by silicon. But due to its high charge carrier mobility—higher than silicon by ...

Carefully crafted light pulses control neuron activity

November 17, 2017

Specially tailored, ultrafast pulses of light can trigger neurons to fire and could one day help patients with light-sensitive circadian or mood problems, according to a new study in mice at the University of Illinois.

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.