General Information

Event name: CA-93-004
Country: CANADA
Nature of the harmful event:
Seafood toxins
Event directly affected:
Shellfish , Humans
Toxicity detected: Yes (Approximate range: 4.0ug/g)
Associated syndrome: DSP
Unexplained toxicity:
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (DFO)
Event occurred before in this location: No
Individuals to contact: McKENZIE, Cynthia , Wells, Terri

Location & Date

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Location: Latitude: , Longitude:
General location information: Alexander Bay/Magics Arm, Bonavista Bay, NL
HAB Area code(s): CA-28
Additional location information: First detection of DSP in Newfoundland
Bloom event dates (yyyy/mm/dd): Event Date:1993-10-27
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Human illness occurred before closure


Causative organism known: Yes
Causative Species/Genus: Dinophysis norvegica (2,000 cells/L)
More than 40,000 cells per mussel
Co-Ocurring Species/Genus: Prorocentrum lima ( cells/L)
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Gilgan et al. 1994; McKenzie et al. 1994; Closure order NTN-1993-10 issued Oct 27 1993. NTN-1993-11 revoked NTN-1993-10 expanding the closure area.

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: Detected by HPLC and confirmed with LC-MS
Economic losses:
Management decision: Closure order NTN-1993-10 issued on Oct 27 1993. NTN-1993-11 revoked NTN-1993-10 expanding the closure area.
Additional harmful effect information: Toxicity and closures continued until August of 1994
Created at 07:30 on 10 Jun 2019