zebra mussels affect lobsters when they stick to the shell of the lobster and when there are many on one lobster it can make it difficult for the lobster to move and there for many lobsters die from zebra mussels attaching to there backs.
Zebra mussels also affect fish populations because when the fish eat the mussel there stomachs can't digest it so it gets stuck in them and causes them to die.
Zebra mussels also affect fish populations because when the fish eat the mussel there stomachs can't digest it so it gets stuck in them and causes them to die.