Paralytic shellfish poisoning toxins in butter clams (Saxidomus gigantea) from the Kodiak Archipelago, Alaska.

•2013–2020 PSP toxin data from Kodiak, Alaska butter clams.•Gonyautoxins were 31–60% of clam toxin load during Aexandrium catenella blooms.•Seasonal variability in toxins among clam body, gut, siphon tip and siphon neck.•Removing siphon tip reduced clam toxins 39% on some instances, but only 3% on others.•Siphon tip removal not effective strategy to reduce PSP risk in Kodiak butter clams.