A small stripped mussel shell sits on a mossly green ball.

Zebra Mussels and Moss Balls

Zebra Mussels (Dreissena polymorpha) are a highly invasive species which are commonly spread through ballast water and contaminated recreation equipment. Zebra mussels can also hitchhike on moss balls.
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Photo By/Credit
Deborah Kornblut/USFWS
Media Usage Rights/License
Public Domain
Subject tags
Aquatic plants
Invasive species