General Information

Event name: CA-06-001
Country: CANADA
Nature of the harmful event:
Mass mortalities
Event directly affected:
Aquaculture Fish
Toxicity detected: No
Associated syndrome: OTHER
Unexplained toxicity:
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 (Harmful Chaetoceros is often seen in this area, but usually at non-lethal concentrations)
Individuals to contact: HAIGH, Nicky

Location & Date

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Location: Latitude: 50.420000, Longitude: -125.920000
General location information: Upper Strait of Georgia, Pacific Region
HAB Area code(s): CA-38
Additional location information: Hardwicke Island near Johnstone Strait. Bloom covered all of Salmon Inlet and some of Sechelt Inlet. Bloom showed a strong vertical diurnal migration.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd): First detection: 2006-10-14,
Additional date-related information: smolts entered into site October 11th, mortalities seen October 12-13, plankton samples sent from October 14,15


Causative organism known: Yes
Causative Species/Genus: Chaetoceros concavicornis (unknown cells/L)
October 14th samples had maximum ~5,000/L
Co-Ocurring Species/Genus: Chaetoceros convolutus (unknown cells/L)
October 14th samples had maximum 10,000/L
Chlorophyll concentration, if known: µg/l
Additional bloom information: Gill samples from mortalities had both Chaetocerous species present.
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
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:

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:
Updated at 02:35 on 16 Feb 2018