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When college students first learn about the invasion of zebra mussels into the Great Lakes approximately 25 years ago, they frequently ask what controls zebra mussel populations in their native regions. If introducing natural zebra mussel predators into the Great Lakes would not cause new problems, this approach might work as an example of:

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Answer:

Some fish here such as the round goby (which came here from the same place in Asia as the zebra mussel), carp, catfish, and drum have been known to eat zebra mussels. A few species of diving ducks also have been eating them here in the Great Lakes. But they are not enough to control the population.

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