General Information

Event name: CA-98-004
Country: CANADA
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 960 g STXeq / 100 g.)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: No
Individuals to contact: WHYTE, Ian

Location & Date

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Location: Latitude: , Longitude:
General location information: various locations in BC, Pacific Region
HAB Area code(s): CA-38
Additional location information: See Complementary Information.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: No
Causative Species/Genus:
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Phytoplankton monitoring is not conducted in British columbia. The occurrence of toxic algae is determined by analysis of biotoxins in the sentinel Mytilus galloprovincialis. Although somewhat anecdotal, densities and distribution of all phytoplankton th
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:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Mytilus califorinanus Domoic Acid DA eq 29.5 LC
Mytilus califorinanus Saxitoxins STX eq 960 Bioassay-Mouse
Kit used: Type of kit used:
Additional information: The occurrence of toxic algae is determined by analysis of biotoxins in the sentines species Mytilus californianus. The mussels are collected , bagged and distributed to wharves, quays and aquaculture sites in different areas along the north and south coasts (Figues 1 and 2). Samples are collected generally at weekly intervals in the summer and bi-weekly intervals in the winter and shipped to the Canadian Food Inspection Agency, CFIA, for analysis. Mouse bioassay is used for PSP evaluation and an HPLC assay for DA.
Economic losses:
Management decision: Closure to bivalve harvest or to clam harvest.
Additional harmful effect information: Table 1 (See complementary Information) presents the highest levels of PSP and DA determined by CFIA. In areas other than those specified in Table 1, levels of PSP were generally <42 g/100g, or when present were at least under the 80 g/100g allowable le
Updated at 02:11 on 26 Sep 2013