Aquatic organisms may be transferred to new locations as
biofouling and can be harmful and invasive in locations where they
do not naturally occur.
The transfer of invasive aquatic organisms can threaten
fresh water, brackish and marine environments, human, animal and plant
life, and economic and cultural activities.
Even when there is no visible biofouling, it is important
to undertake the minimizing measures outlined in this guidance as
light fouling (e.g. the slime layer) is likely to be present and the
measures will help ensure that heavier fouling does not develop. Once
invasive aquatic species are established in a new location or habitat,
they are often impossible to eradicate.