Name one invasive species that lives in the ocean

Asian Carp. Asian carp are fast-growing, aggressive, and adaptable fish that are outcompeting native fish species for food and habitat in much of the mid-section of the United States.

The green crab

Explanation:

This European crab has been carried by ships in ballast water and is sold as fish bait in much of the world. It now has established populations on both coasts of North America, in southern South America, Australia, South Africa, and Japan. It is a predator of many forms of shore life, including worms and mollusks. In some areas, the crab’s voracious appetite has affected the commercial shellfish industry.