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if it did, water would have became less clean and could be toxic

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If the water temp increase it would have had a effect on the fish

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Are there a dis-balance in the amount of boys and girls in fish that is affecting reproduction?

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Is there any climate changes of changes in landforms or are there any landslides that may be affecting the environment?

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No, sea lampreys are injuring and/or killing a lot of the trout. The problem isn't their food population.

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As the population of humans is growing the climate is becoming warmer due to CO2. The people of the place nearby also might be building

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Yes; according to the food web, their main predators are walleye and great blue herons.

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The prey is probably moving or migrating because of changing water temperatures.

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Do trout have predators?

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is there an invasive species disturbing the balance of the great lakes

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Are other species eating the eggs of the trout?

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What is going on with the trout's prey and their prey?

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Why do the trout prefer cooler climates as they mature?

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Has the population of the prey of trout decreased as well?

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Has their food population declined?

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Is there something wrong with the environment? If so, what is it? Pollution? Dangerous circumstances? Global warming? Is there any outer damage to the fish that could be caused by dangers in their habitat?