There are also three records of sea lamprey caught from the Gulf of Mexico, where a relic population possibly existed (Gilbert and Snelson, 1992). Along the east coast of North America, they are found from the Gulf of St. Lawrence to northern Florida. Sea lamprey (Petromyzon marinus) are an aquatic nuisance species that cause great harm to fishes in the Great Lakes. Sea lampreys (Petromyzon marinus) are parasitic fish native to the Atlantic Ocean.Sea lampreys, which parasitize other fish by sucking their blood and other body fluids, have remained largely unchanged for more than 340 million years and have survived through at least four major extinction events.

The sea lamprey has an eel-like body without paired fins. Drawings by E. N. Fischer. The Sea…

Sea lamprey predation, in combination with other factors (i.e., overfishing and hybridization with more common cisco species), led to the extinction of three endemics in the Great Lakes; the longjaw cisco Coregonus alpenae, the deepwater cisco C. johannae, and the blackfin cisco C. nigripinnis (Miller et … Sea lamprey larvae live in Great Lakes tributaries that have suitable habitat until they become juveniles or “transformers.” Impacts of Sea Lamprey in the Great Lakes The devastating impact of the sea lamprey on Great Lakes sport, commercial and Aboriginal fisheries in the 1940s and 50s led Canada and the United States to form the Great Lakes Fishery Commission in 1955. Sea Lamprey: A Great Lakes Invader. Its mouth is jawless, round and sucker-like, and as wide or wider than the head; sharp teeth are arranged in many consecutive circular rows.
The sea lamprey is an incredibly destructive invasive species. Control of sea lamprey is vital t… In sea lamprey, Petromyzon marinus, the heart ratio (heart weight/body weight) x 100 is higher than that found in most poikilothermic vertebrates and appro­aches in magnitude of the average value of mammals.

In adult form, it can easily be distinguished from the other lampreys by both its size and its sharply mottled colouration. about 18 inches long, Merrimac River; and open mouth disc of another Merrimac River specimen to show the arrangement of the horny teeth, about 0.9 times natural size.From Bigelow and Schroeder.

The Sea Lamprey Petromyzon marinus is the largest of the three lamprey species found in the British Isles and reaches lengths of up to 1.2 m and weights up to 2.5 kg. There are 7 branchial or gill -like openings behind the eye. Sea lamprey occur in the northern Atlantic Ocean, off the coasts of North America and Europe. Sea Lamprey Control in the Great Lakes: A remarkable success! Figure 3.—Sea lamprey (Petromyzon marinus).