I was strictly refreshing a bit of history on how the world used to be before 90% to 95% of all trade on earth became marine. Between the ballast waters and the antifouling, it is virtually accessible to any species around the world. Unless strict measures are put in place to prevent the spread of species latching on to hulls or finding themselves in the ballast waters, then any place will potentially be a new home, given that they're there.
This approach has been taken in a variety of ways to reduce or stop transfers of aquatic species across the world, including having toxic substances put on hulls of ships, which we know is now banned. I know the United States back in 2001 required vessels to release ballast waters at sea before getting into coastal waters. That's a key aspect to preventing aquatic species from getting into coastal waters.
I read something a while ago about using heat or UV light within the hull of the ship to try to destroy or kill undesired species. You can also coat the vessel's hull with a non-toxic layer of vinyl resin, I believe, and then reinforce that with glass and it will reduce not only the drag on the ship itself but also the ability of fouling species to actually get onto the ships themselves. I believe that was through Hydrex underwater technology.