| 21. | Using and economic model of recreational fishing to evaluate the benefits of Sea Lamprey control on the St . Mary s River.
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| 22. | Sea lampreys mark favored spawning streams with this substance, allowing them to locate the streams at a great distance from open waters.
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| 23. | Its numbers have dropped due to the introduction of exotic, non-native species such as the sea lamprey, loss of habitat and historic overharvest.
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| 24. | The lamprey fell off after less than 6 meters, so the railway was determined to be effective at preventing the sea lamprey's migration.
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| 25. | One of the first exotic invaders of the Great Lakes was the sea lamprey, an eel-like fish that preys on lake trout populations.
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| 26. | The ballast water threat has been acknowledged since the 1950s when sea lamprey, hitching a ride in ballast water, infected the Great Lakes.
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| 27. | By 1932, the sea lamprey had arrived in Georgian Bay, and, together with the Great Depression, it brought the decline of the fishing industry.
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| 28. | The sea lamprey, native to the Atlantic Ocean, is believed to have invaded the Great Lakes through shipping channels in the early 20th century.
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| 29. | Moments later, an oafish 10-pound carp lumbered by, followed by a wriggling sea lamprey, perhaps trying to hitch a ride with its rasping mouth.
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| 30. | Some individuals can start the hematophagous feeding in the river before migrating to the sea, where sea lampreys prey on a wide variety of fish.
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