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The Brief

Pennsylvania has identified almost 60 invasive aquatic animal species of greatest concern.

Some, like zebra mussels and northern snakehead, are already in state waters.

Others, including silver carp and bighead carp, are not yet present and must be prevented.

Pennsylvania officials say nearly 60 invasive aquatic animal species pose risks to the state’s lakes, rivers and streams. These include highly impactful species already spreading, along with dangerous potential invaders that have not yet reached the commonwealth.

What we know:

The Pennsylvania Department of Agriculture’s list of identifies species classified as Established , Emerging , or Potential threats. Groups include fish, invertebrates, mollusks, crayfish, reptiles and more.

According to the Penn

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