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No weather is not causing there food source to die. sea lamprey are eating them and there food.

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No their prey did not go extinct. The sea lamprey were eating too many lake trout and a lot of the lake trout's food too.

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They take their nutrients

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As temperature rises and dissolved oxygen decreases, fish begin to experience stress. These stresses begin to set in well before the water temperature reaches lethal limits. For example, rainbow trout are said to be able to survive in temperatures up to and exceeding 77°F (24°C), but stop growing at 73°F (23° C).

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Lake trout aren't going anwhere. Sea lamprey are actually feeding on the lake trout by sucking their blood from the fish

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How are sea lamprey attacking lake trout?

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What are sea lamprey doing to lake trout?

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How did 𝘚𝘦𝘢 Lamprey get into the Great Lakes?

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Sea lamprey are active predators and are parasitic
(They are like parasites)

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Is there something eating there eggs.

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Is the weather causing there food to die

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Are they moving where there is a big population of predators

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What is the proper lake trout water temperature?

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Are sea lamprey parasites that affect lake trout.

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What can humans do to protect lake trout?

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What does sea lamprey have to do with the lake trout

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(Probably doesn't happen but...) do any organisms migrate at different parts of the year

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Is there a direct effect on there food source

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Is there a direct effect on there food source

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Did a different part of the food web start eating too much of a different thing that ended up affecting the amount of food the trout are getting?

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How far down the food web did the food fail?

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Is there something going on in the environment causing them to not reproduce.

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Is pollution causing there babies to not hatch

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Is pollution causing there babies to not hatch

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What temperature do trout live in?

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What species hunt trout?

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Is the loss of a organism in another food chain having a indirect effect on trout?

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Is pollution somehow stopping plants and organisms at the bottom of the food chain to stop making food?

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There could be a disease affecting the food. If the food is not safe to eat then the trout could die.

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Did there reproductive system obtain a disease

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Did there reproductive system obtain a disease

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Did there food get a disease meaning they die off

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Did there food get a disease meaning they die off

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Yes, lake trout are predators. They will eat fish smaller than them. When they are smaller they will eat invertebrates instead.

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If a food is missing in the the food chain/web it could bring it all down due to indirect or direct declining.

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Did there prey move because of the lack of nutrients in a certain place

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Did a new disease come up because of weather 

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Did a new disease come up because of weather 

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Lake trout eat many different foods such as crayfish.

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Trout eat crayfish, small fish, shrimp, native waterfleas, and other small animals that live in lakes

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Did there prey migrate because of bad weather.

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Did there prey migrate because of bad weather.

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Did there prey go extinct?

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Are they going somewhere else?

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Was there not enough nutrients for the plants to create their own food so the plants live and then the fish can eat them?

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What animals change through the seasons?

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What animals change through the seasons?

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Is there a disease going on affecting the food source?

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Did another animal arrive in their environment that could be a predator?

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Is there pollution going on to kill the lake trout?

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Is the temperature increasing and causing them to not be able to reproduce, or have a stable food source.

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Is there something going on to cause lake trout to not reproduce?

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How much food do the trout need to eat to survive?

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Did the demand Trout increase on the fish market, so more fishermen are fishing them.

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What population limit can their habitat sustain?

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Do they eat plants? If so, are these plants becoming more rare??

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If organisms only have one gender, will it change the population?

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What do lake trout eat?

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Are they predators?

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Was there too many guys and not enough girls in the poplation?

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Is there some invasive species being introduced (By accident or on purpose) to the environment and eating the Trout or there food source

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Can not having food affect many populations, or just one?

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Does habitat affect a population?