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Weather:
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Turbidity (NTU):
|
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Wind direction:
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|
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Stratified water:
|
No |
Oxygen content (nL/L):
|
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Wind velocity:
|
|
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Temperature (°C):
|
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Oxygen saturation %:
|
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Current Direction:
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Sechhi disk (m):
|
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Salinity:
|
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Current Velocity:
|
0
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|
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Nutrient information:
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|
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Temperature Range During Event:
|
Max: °C, Min: °C
|
|
Salinity Range During Event:
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Bloom location in the water column:
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|
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Growth:
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Growth Comments
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Not known, but may be part of a similar bloom in central California.
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Additional Environmental information:
|
Not known, but there are indications that water temperature is higher than usual.
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Species containing the toxin
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Toxin type
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Toxin details
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Max. concentration
|
Assay type
|
|
Razor clams
|
Domoic Acid
|
DA eq
|
|
LC
|
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Dungeness crab
|
Domoic Acid
|
DA eq
|
|
LC
|
|
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Kit used:
No
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Type of kit used:
|
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Additional information:
|
Toxin assays done by U.S. Food and Drug Administration and National Marine Fisheries Service using acid or methanol extraction followed by HPLC (same method used in Canadian studies)
|
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Economic losses:
|
|
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Management decision:
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Closure of commercial and recreational harvest of razor clams on Oregon/Washington beaches;
closed commmercial fishery for Dungeness crabs from northern California to northern Washington for nearly a month;
spring, 1992, recreational harvest for razor
|
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Additional harmful effect information:
|
Razor clams are still toxic in mid-March 1992 with domoic acid levels of 30-60 ppm (regulatory closure level is 20 ppm); most toxin was found in the edible parts of the clams rather than in the viscera, but in crabs, most toxin was found in the viscera wi
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