Parasitic worm populations are skyrocketing in some fish species used in sushi

Researchers aren’t sure if the Anisakis worm increase signals environmental recovery or decline

Anisakis parasites on a salmon fillet

Anisakis parasites, here on a salmon fillet, can reach up to 2 centimeters in length. They can make diners sick, but freezing or cooking kills the worms.

Togabi/Wikimedia Commons

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