How the Northern Snakehead Invaded American Waters

The northern snakehead, native to Asia, has established populations in the U.S. through several pathways:

Intentional Release

Imported as aquarium pets or live food fish, some were deliberately released by owners or restaurants.

Unintentional Introduction

Ballast water from ships may have carried eggs or juveniles across the Pacific.

Natural Dispersal (Unlikely)

Snakeheads cannot survive open ocean, making natural migration improbable.

Most Likely Scenario

Human-mediated release—both pet dumping and live-food market escapes—is the primary cause. The fish’s ability to breathe air and move short distances overland aids its spread once introduced.