General Information

Event name: NO-99-001
Country: NORWAY
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: Positive to DSP.)
Associated syndrome: DSP
Unexplained toxicity: Yes (In addition to DSP also YTX was recorded.)
Species implicated in toxin transmission (transvector): Mytilus edulis.
Report the outcome of a monitoring programme: Yes (National Monitoring in Norway.)
Event occurred before in this location: Yes (Recurrent.)
Individuals to contact: DAHL, Einar

Location & Date

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Location: Latitude: , Longitude:
General location information: , Norwegian Skagerrak-coast.
HAB Area code(s): NO-11
Additional location information: ICES fishing area: III a
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: September-December 1999.


Causative organism known: Yes
Causative Species/Genus: Dinophysis acuta (1,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: 2-4 g/L Chl in the period the shellfish bec µg/l
Additional bloom information:
Event-related bibliography: Dahl, E. and Johannessen, T. (2001). Relationship between occurrence of Dinophysis species (Dinophyceae) and shellfish toxicity. Phycologia, 40 (3).

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 edulis Okadaic Acid OA eq ~ 200 ppm Enzyme Inhibition
Mytilus edulis Okadaic Acid Positive Bioassay-Mouse
Kit used: Type of kit used:
Additional information: Enzyme Inhibition: PP2A. Standard mouse bioassays were also positive. Mouse bioassay, mortality within 1-2 h.
Economic losses: Mussel plants were banned from harvesting.
Management decision: Harvesting was stopped and the public was warned.
Additional harmful effect information: No intoxications wer reported, the public was warned.
Updated at 03:06 on 5 Mar 2018