General Information

Event name: CA-03-008
Country: CANADA
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Mass mortalities
Event directly affected:
Aquaculture Fish
Toxicity detected: No
Associated syndrome: OTHER
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Harmful Algae Monitoring Program.)
Event occurred before in this location: Yes (Blooms of Dictyocha species, primarily Dictyocha speculum, have occurred in this area before, but not causing mortalities.)
Individuals to contact: WHYTE, Ian

Location & Date

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Location: Latitude: 50.316667, Longitude: -125.016667
General location information: Upper Strait of Georgia, Pacific Region
HAB Area code(s): CA-38
Additional location information: Raza Island, mid-east Vancouver Island. Bloom was seen in varying thinckness, from Georgia Strait to Jonhstone strait.
Bloom event dates (yyyy/mm/dd): Event Date:2003-07-14
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Bloom lasted throught July and August.


Causative organism known: Yes
Causative Species/Genus: Dictyocha speculum (960,000 cells/L)
Co-Ocurring Species/Genus: Dictyocha fibula (500,000 cells/L)
maximum concentration of non-skeletal form 400,000 cells/L
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Yes Oxygen content (nL/L): 12.2@5m Wind velocity:
Temperature (°C): 15.5@1m Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 25@1m, 30@10m Current Velocity:
Nutrient information:
Temperature Range During Event: Max: 17.8 °C, Min: 10.8 °C
Salinity Range During Event: Max: 31, Min: 23
Bloom location in the water column:
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information:
Created at 08:50 on 11 Jul 2013
Updated at 03:03 on 16 Feb 2018