Dreissena polymorpha (zebra mussel) was introduced through 
ballast water discharge in the Great Lakes of North America, 
causing a negative impact on nature, nature's contributions to 
people, and good quality of life.
Photo credit:Thirdwavephoto, WM Commons - CC BY 4.0
29SUMMARY FOR POLICYMAKERS
19SUMMARY FOR POLICYMAKERS
BACKGROUND
Box SPM 2 The International Convention for the Control and Management of Ships' 
Ballast Water and Sediments: an example of international collaboration to 
prevent biological invasions.