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Puffin population decreased due to migration of cold water plankton. But now they have a stable population of 12-14 million. :)

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animals that suck the blood of trout

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What are people doing to stop the Sea Lamprey?

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What are people doing to stop the Sea Lamprey?

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People have been injecting fluids/poisonous things into some of the male Lampreys, so that when they mate, the female Lampreys also get the poison inside them. Also, they have been putting Lampricide in streams and ponds (it's not poisonous to other animals) to kill the sea lamprey.

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Lake Trout are decreasing because of the invasive species, Sea Lamprey. There are too many Sea Lamprey, and they are hurting the trout (and other fish) a LOT.

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In 1950, Lake Whitefish declined due to exploitation, habitat degradation, and invasive species introductions.

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when fish eggs are presented then trout will eat them.

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Question: Have Alewives been decreasing?

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Question: Have Alewives been decreasing?

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According to Conservation Gateway, "The alewife population in Lake Michigan has declined in the last decade."

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No. The walleye population is stable

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young trout eat plankton and insect larvae and adults prefer fish.

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Between 1970 and 1980, there was a decrease in rainbow smelt due to a rise in erosion and dams.

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Q: Which Great Lake hosts the most Lake Trout?

A: Lake Superior and Parts of Lake Michigan.

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great blue herons have a 6-7 foot wingspan

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In 1967 it was put on the endangered species list, because of, "alteration of river habitats by large mainstem dams."

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Q: How tall are Great Blue Herons?

A: They are 4.5 Feet Tall.

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Question: Are trout's predators over populating?

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Question: Are trout's predators over populating?

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Trout's predators (Great Blue Herons and Walleyes) are not overpopulating.

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There has been an increase in the Great Blue Heron population by ten percent starting in 1960. (According to Bird Life Data Zone.

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There has been a reduction in plankton and phytoplankton in Lake Michigan and Lake Huron

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Some lake tout can live up to 70 years

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Yellow perches eat lake herrings, aquatic insects, and leeches.

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Big trout eat fish. Small trout eat invertebrates (fish without backbones). They also eat freshwater shrimp, crayfish, sculpins, rainbow smelt, chub, and alewives. Baby trout eat young insects.

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Sculpin, rainbow smelt, chub and alewives (trout's prey) all eat plankton.

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Mature lake trout eat vertebrates such as rainbow smelt, sculpin, chub, and alewives. This is because they are much bigger than their prey. Small and young trout prey on small insects and small invertebrates such shrimp and crayfish. These invertebrates are larger than the insects but still small enough for the small trout to eat them.