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Transcript of Sea Lamprey
Sea Lamprey was first discovered in Lake Ontario in 1835, which is also native to it. They generally ascend to freshwater rivers to spawn.
What's A Sea Lamprey?
Sea Lampreys are
primitive jawless fish native to the Atlantic
Ocean. In the Great Lakes, there are several
different types of native lampreys (including
the silver lamprey, the American brook lamprey, and
the northern brook lamprey)
Although lampreys resemble eels, lampreys lack
jaws and possess only cartilage. Lampreys have a
large sucking disk for a mouth and a well-developed
sense of smell. The mouth is filled with sharp teeth
that surround a file-like tongue. A lamprey’s body
has smooth, scaleless skin and two dorsal fins, but
has no lateral line, no vertebrae, no swim bladder,
and no paired fins.
Sea lampreys have had an enormous negative
impact on the Great Lakes fishery. Because sea
lampreys did not evolve with naturally occurring
Great Lakes fish species, their aggressive, predaceous
behavior gave them a strong advantage over
their native fish prey. Sea lampreys prey on all
species of large Great Lakes fish.
How Do Sea Lampreys
Affect the Great Lakes
Of the 5,747 streams and tributaries of the
Great Lakes, 433 are known to produce sea lampreys
and about 250 are treated on a regular cycle.
The Great Lakes Fishery Commission treats approximately
60-70 streams a year for sea lampreys.