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Why are the sea lamprey staying in the great lakes?

How can they survive in the great lakes?

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The invasive species in the great lakes (sea lamprey) are the cause in the decline of trout population.

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The sea lamprey probably took a route to get to the lake trout, and then they over populated, which is why the trout population declined.

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The sea lamprey and the lake trout live in the same lake?Why are the sea lamprey are making holes  on the trout?

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The sea lamprey and the lake trout live in the same lake?Why are the sea lamprey are making holes  on the trout?

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Could there be another fish besides the sea lamprey that are preying on the trout? Do the sea lamprey only eat the trout?

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Is the sea lamprey the main cause for the decline in trout population? Are they an invasive species?

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Are the sea lamprey the reason why the trout population is decreasing? Where were the sea lamprey before they went to Lake Michigan?

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what are the wounds on the lake trout the fisherman are finding? is it from another fish? or is it from humans

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what are the wounds on the lake trout the fisherman are finding? is it from another fish? or is it from humans

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other organisms are coming into the lake

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There might have been a decrease in yellow perch and aquatic insects at the time, which made the lake trout have less food.

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is the plankton population going down?
if there is no algae then what happened to the fish that the trout eat?

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There was probably a drought that evaporated some lakes, thus killing off the trout population.

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There could have been something bad in the ocean that the trout were eating.

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Maybe what the trout are eating isn't really food? Could there be a break in the food chain/web? Is there a decrease in population of what the trout usually eat?

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Maybe what the trout are eating isn't really food? Could there be a break in the food chain/web? Is there a decrease in population of what the trout usually eat?

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Over population, not enough food, and a disease.

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Over population, not enough food, and a disease.

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too much of one gender
people overfishing
something wrong with the water

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global warming
preditors could be eating them