General Information

Event name: CA-87-006
Country: CANADA
Nature of the harmful event:
Seafood toxins
Event directly affected:
Shellfish , Humans
Toxicity detected: Yes (Approximate range: domoic acid 790 g/g wet wt (Mytilus edulis))
Associated syndrome: ASP
Unexplained toxicity:
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location: No
Individuals to contact: BATES, Stephen S. , McKENZIE, Cynthia

Location & Date

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Location: Latitude: , Longitude:
General location information: Cardigan Bay, Eastern Prince Edward Island, Gulf Region
HAB Area code(s): CA-24
Additional location information: Boughton River, Murray River; Bloom extended ~10 km seaward from mouth of Cardigan River on 18 Dec 1987
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd): First detection: 1987-11-27,
Additional date-related information: Bloom start:before late Nov87, end:mid-Feb88


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia multiseries (15,000,000 cells/L)
(previously known as Nitzschia pungens f. multiseries)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Highest P. multiseries concentration: 15,000,000 cells/L on 11 Dec 1987.
Event-related bibliography: Bates, S.S., C.J. Bird, A.S.W. de Freitas, R. Foxall, M. Gilgan, L.A. Hanic, G.R. Johnson, A.W. McCulloch, P. Odense, R. Pocklington, M.A. Quilliam, P.G. Sim, J.C. Smith, D.V. Subba Rao, E.C.D. Todd, J.A. Walter, and J.L.C. Wright. 1989. Pennate diatom Nitzschia pungens as the primary source of domoic acid, a toxin in shellfish from eastern Prince Edward Island, Canada. Can. J. Fish. Aquat. Sci. 46: 1203-1215.

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
Mytilus edulis Domoic Acid 790 g/g wet wt LC-UV
Kit used: Type of kit used:
Additional information: HPLC-UVD
Economic losses:
Management decision: Entire Atlantic shellfishery closed 11Dec87, reopened starting 7Jan88 (all open by Apr88)
Additional harmful effect information: >150 people ill; 3 elderly died; 22-25Nov87; This is the first incident of ASP worldwide, and the first diatom known to produce a biotoxin.
Created at 07:21 on 29 Mar 2018
Updated at 09:24 on 29 Mar 2018