General Information

Event name: US-00-014
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Mass mortalities
Event directly affected:
Planktonic life , Natural Fish
Toxicity detected: No
Associated syndrome:
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location: No
Individuals to contact: CONNELL, Laurie

Location & Date

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Location: Latitude: , Longitude:
General location information: Hood Canal., Washington.
HAB Area code(s): US-24
Additional location information: UTM- 0488308 N - UTM 5246152 W Most concentrated in south Hood Canal but spread to northern end of Hood Canal by 17 Sept 2000.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Heterosigma akashiwo (270 x (10) cells/L)
predominantly unialgal
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Clear- sunny. Turbidity (NTU): 0.3 Wind direction:
Stratified water: Yes Oxygen content (nL/L): 9.7, 1.1, Wind velocity:
Temperature (°C): 14 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:
In situ
Growth Comments Did spread north for several km. 40% of Hood canal was visibly discolored as viewed from air.
Additional Environmental information: Oxygen mL/L: 9.7 (surface) 1.1 at 30m and 4.1 at bottom. We are still collecting information from the several agancies involved.

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: Skokomish tribe spopped fisheries harvest during the bloom- unknown economic impact.
Management decision:
Additional harmful effect information: Divers reported vomiting- however they were new divers and the bloom was very dense and disorienting.