English example sentences with "ballast"

An invasive species can be introduced to a new area via the ballast water of oceangoing ships, intentional and accidental releases of aquaculture species, aquarium specimens or bait, and other means.
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Invasive species can be introduced to an area by ship ballast water, accidental release, and most often, by people.
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Zebra mussels arrived in the mid-1980’s in ship ballast water from the Black and Caspian Sea region, and have become a major threat to wildlife, navigation, and boating.
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Scientists say the invasive species arrived in the Mediterranean from Asia in the ballast of cargo ships, creating an “environmental nightmare.”
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