Scientists are investigating the widespread presence of paralytic shellfish toxins in Alaska's marine food chain, which may explain recent species die-offs.

Knik Tribe data reveals high levels of paralytic shellfish poisoning toxin in some Alaskan subsistence shellfish harvests, with variability in toxin levels across different locations.

Knik Tribe officials have found very high levels of the toxin which causes paralytic shellfish poisoning in samples from Southern Alaska mussels and clams — but they warn that parts of some fish, including king salmon, may also contain the toxin

High levels of PSP toxins have been found in razor clams in Chignik Lagoon and blue mussels in Sand Point, Alaska, making them unsafe to eat and potentially causing paralytic shellfish poisoning, with no known cure.

The Southeast Alaska Tribal Ocean Research program found that all shellfish species in Settler's Cove and Seaport Beach in Ketchikan and Starrigavan North beach in Sitka are affected by high levels of Paralytic Shellfish Toxin, posing the risk of Paralytic Shellfish Poisoning for consumers.

A person has died from paralytic shellfish poisoning after eating blue mussels and snails in the Aleutian Island community of Unalaska, state health officials confirmed Wednesday.

A group that monitors shellfish toxin levels is warning Juneau residents not to consume shellfish from locations in the Auke Bay area.

Unusually high PSP toxin levels making shellfish unsafe to eat.