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Trout lay their eggs in nests in the river gravels, known as redds. The female (hen) builds the nest, usually between November and January when the water is cold and carrying lots of oxygen, because that is what the eggs need to hatch.

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Some invasive species can cause a population to decrease.

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https://www.youtube.com/watch?v=uVh4UF-3H9A
Try not to get sick

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Invasive species would cause a population to change.

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Females lay their eggs in the fall, choosing water that is 6-10 feet (2-3m) deep and close to the shoreline. typically,lake trout spawn on gravel to protect their eggs, as well as someplace with some water movement to ensure steady oxygen.

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How big is the fishing industry

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Could the environment be getting destroyed.

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What if a smaller fish population decreases that the lake trout eat and the lake trout start to die

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How much food does a lake trout eat per day

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Is something that they are eating have a disease that are affecting them?

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Why is the population for some animals in different places.

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Is the temperature of the water heating up?

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Is the water getting darker

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Are some organisms declining?

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Are other species eating the trouts food?

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What type of food do the crayfish eat?

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How do plants grow without soil?

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Where do the lake trout lay their eggs

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Whats an invasive species?

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Is there a decline in a specific gender of the lake trout that makes it harder to reproduce

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Was there any pollution in the great lakes that could've affected the population?

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Is there a predator eating the lake trout?

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Is there an invasive species that has invaded and killed most of the population.

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There might be a genetic mutation that prevents the lake trout from laying eggs.
- River