General Information

Event name: US-91-019
Nature of the harmful event:
Water Discoloration
Event directly affected:
Toxicity detected: No
Associated syndrome:
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (Previous occurrences with suspect Notiluca have been reported.)
Individuals to contact: OSTASZ, Michael J.

Location & Date

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Location: Latitude: 60.625000, Longitude: -145.916667
General location information: Simpson Bay., Alaska.
HAB Area code(s): US-25
Additional location information: U-shaped, 8 mile long on NE shore of Orca Bay, 8 miles NW of Cordova.
Bloom event dates (yyyy/mm/dd): Event Date:1991-06-04
Start: 1991-06-04,
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: No
Causative Species/Genus: Noctiluca sp. ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: No Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth Comments
Additional Environmental information: Popular sport clam harvesting area for residents of Cordova. Area is not commercially certified.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: No Type of kit used:
Additional information:
Economic losses:
Management decision: Sample indigenious product (mussels) for background levels. Sample taken by Alaska Dept of Fish Game Sports Division, Cordova, Alaska.
Additional harmful effect information: Water discoloration (red).