Editing Port (section)

===Invasive species===
[[Invasive species]] are often spread by the [[bilge water]] and species attached to the hulls of ships.<ref name=":0" /> It is estimated that there are over 7000 invasive species transported in bilge water around the world on a daily basis<ref>{{Cite web|title=What are California Marine Invasive Species?|url=https://wildlife.ca.gov/OSPR/Science/Marine-Invasive-Species-Program/Definition|access-date=2021-05-13|website=wildlife.ca.gov}}</ref> Invasive species can have direct or indirect interactions with native sea life. Direct interaction such as predation, is when a native species with no natural predator is all of a sudden prey of an invasive specie. Indirect interaction can be diseases or other health conditions brought by invasive species.<ref>{{Cite web|date=2021-05-07|title=Invasive and Exotic Marine Species|url=https://www.fisheries.noaa.gov/insight/invasive-and-exotic-marine-species|access-date=2021-05-13|website=NOAA Fisheries|publisher=NOAA|language=en}}</ref>
[[File:Wawona_-_pumping_bilge_water.jpg|thumb|A ship pumping bilge water into a harbor]]