Pronunciation of the English word ballast.
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1. | 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. | |
2. | Invasive species can be introduced to an area by ship ballast water, accidental release, and most often, by people. | |
3. | 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. |