Amendments to an international treaty aimed at preventing the spread of potentially invasive species in ships’ ballast water entered into force on 13 October 2019.
Ships regularly take on sea water, in tanks, to ensure their stability. Known as ballast water, this can contain many aquatic species, including in microscopic or larval form. These can become invasive and harmful if the ballast water is released, unmanaged, in a new location at the end of an ocean voyage.
The International Convention...
https://www.marineinsight.com/shipping-news/imo-addresses-invasive-species-in-ships-ballast-water-treaty-amendments-enter-into-force/