Thank you for the response. In all seriousness, you are giving me an education on shipping that I did not have.
However, to my point, is it possible that invasive species would be less infested in freshwater areas had we as a species done much less sea based transport because it was cost prohibitive?
How about other invasive species? How about zebra muscles: https://www.usgs.gov/faqs/what-are-zebra-mussels-and-why-sho...