SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/fish-red-water-psp

Does clear water mean shellfish toxins are not present?

No, toxic water may look clear.

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  1. Yes, clear water is always safe
  2. No, toxins can occur in clear water ✔
  3. Yes, but only for oysters

Why: DOH says red or muddy colored water is no indication of PSP. High toxin levels can also occur in crystal clear water.

Huh, didn't know that: Most of the red-colored algae in Washington are not toxic.

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References

Answer: No, toxins can occur in clear water. DOH says red or muddy colored water is no indication of PSP. High toxin levels can also occur in crystal clear water.

  1. Washington DOH Biotoxins: Myths and Misconceptions doh.wa.gov/community-and-environment/shellfish/recreational-shellfish/illnesses/biotoxins/myths-and-misconceptions
    Red or muddy colored water is no indication of PSP.
    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
    most of the red-colored algae in Washington are not toxic.
    Checked 2026-10-10.

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FishingIs touching a shellfish to your tongue a reliable toxin test?FishingIs it true that shellfish are safe in months with the letter R?FishingBefore a Washington razor clam beach opens, how many toxin test samples must pass?

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