[DOC] [TLE] Invader Fish Threatening Great Lakes - tribunedigital-chicagotribune [PAR] May 30, 1988 ... Though it is too early to tell, the river ruffe, which is a perch-like fish, could rank ... 
The sea lamprey, an eel-like primitive fish, has a sucker-like mouth filled with 
teeth. ... Sea lampreys wiped out some Great Lakes lake trout populations in the 
1940s and ... It is a bottom-feeding fish and will eat almost anything. [DOC] [TLE] Lamprey Pictures - A Primitive Jawless Fish | SeaPics.com [PAR] Lampreys are scaleless, eel-like, cartilaginous fish that have a round, ... and they 
are considered a major pest in the Great Lakes of North American, where they ... 
native fish populations, such as lake trout, rainbow trout, brown trout, walleye,... [DOC] [TLE] 'Vampire of the lakes' found in Komoka Creek | The London Free Press [PAR] Jun 3, 2015 ... Eel-like fish once threatened to ruin the multibillion-dollar Great Lakes fishing 
industry ... They almost decimated the populations of lake trout in the upper .... 
Changes in climate, migration, etc. caused the introduction of plants... [DOC] [TLE] The Post-Crescent from Appleton, Wisconsin  Page 27 [PAR] The scientists of the great lakes fisheries commission plan this year to use ... The 
lamphrey, a primitive, eel-like fish, has been in the St. Lawrence river and Lake 
Ontario ... A breakdown by age groups shows that nearly 43 per cent of the 
violators ... hauled into court for fishing without a license than for any other single 
cause. [DOC] [TLE] Gars, eels range in Texas rivers and lakes - Houston Chronicle [PAR] Feb 8, 2010 ... I remember back home in the 50's, fishing the Little River and Brazos. ... The 
alligator gar is the largest freshwater fish in Texas and one of the largest species 
in North America. ... Within a year, young American eels transform into more eel-
like ... The Texas record is nearly 35 pounds caught in Lake Texoma. [DOC] [TLE] The Trout and Salmon of the Pacific Coast - Beyond Searsville Dam [PAR] ... and Jordan). CRESCENT TROUT: Salmo crescentis (Jordan and Seale). ... an 
employee of the great fur company, ... Lake region, the Alleghanies and the val- 
... Most primitive of the American spe- ... ward; southward as far as Eel Eiver in ... 
cause the spots vary interminably. .... these marks even young fish, like the one. [DOC] [TLE] The Lake as a Microcosm, by Stephen A. Forbes - Courses [PAR] May 2, 2008 ... time, for the conditions of life there are primitive,--the forms of life are .... This 
sudden development of their food resources causes, of course, ..... Of the peculiar 
fish fauna of Lake Michigan--the burbot, white fish, trout, ... planarians,--in the 
mud minute Anguillulid, like vinegar eels, and a ..... exterminate itself. [DOC] [TLE] Fish Packs - Wisconsin Department of Natural Resources [PAR] Fish Packs are a subset of the Great Lakes ParkPacks. ...... late 1950s, lampreys 
had contributed to the extermination of several fish ..... Experiment with some 
primitive fishing equipment and think about how ..... They will eat almost 
everything that looks or smells like food. ...... These eel-like fish are 12 - 20 inches 
long. [DOC] [TLE] Indians in the Great Lakes region - MSU Department of Geography [PAR] The first inhabitants of the Great Lakes basin arrived about 10,000 years ago. ... 
established hunting and fishing communities throughout the Great Lakes ... 
However, the Indians used only a portion of their holdings for crops and so 
caused few ... Native Americans in the Great Lakes region lived in hogans or 
wigwams like... [DOC] [TLE] A Long-term Program of Sea Lamprey Control in Lake Champlain [PAR] Two Great Lakes, Erie and Ontario, use lake trout wounding rates as ... Lamprey 
are eel-like in shape and unlike other more advanced fishes, have a .... body of 
evidence indicated parasitism by sea lamprey to be the cause. ..... Use 
Chemicals for the Control and Extermination of Undesirable Fish, and a new 
Adirondack

Question: This primitive eel-like fish almost caused the extermination of the Great Lakes trout
Answer: lamprey