SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/fish-cooking-biotoxins

Does boiling toxic shellfish make them safe?

No, cooking does not destroy biotoxins.

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  1. Yes, 5 minutes is enough
  2. No, biotoxins survive cooking ✔
  3. Yes, if you add lemon

Why: Cooking kills germs such as Vibrio and norovirus but not marine biotoxins. Freezing doesn't help either.

Huh, didn't know that: Biotoxins are not caused by pollution and can show up in otherwise pristine water.

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References

Answer: No, biotoxins survive cooking. Cooking kills germs such as Vibrio and norovirus but not marine biotoxins. Freezing doesn't help either.

  1. Washington DOH Biotoxins: Myths and Misconceptions doh.wa.gov/community-and-environment/shellfish/recreational-shellfish/illnesses/biotoxins/myths-and-misconceptions
    Biotoxins are not destroyed by cooking.
    Checked 2026-10-10.
  2. Washington DOH Biotoxins: Myths and Misconceptions doh.wa.gov/community-and-environment/shellfish/recreational-shellfish/illnesses/biotoxins/myths-and-misconceptions
    There is no correlation between biotoxins and pollution.
    Checked 2026-10-10.
  3. Washington DOH Marine Biotoxins doh.wa.gov/community-and-environment/shellfish/recreational-shellfish/illnesses/biotoxins
    Marine biotoxins are poisons produced by some microscopic plants or algae called phytoplankton.
    Checked 2026-10-10.

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