General Information

Event name: NO-96-001
Country: NORWAY
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 16,000 ME/100 g - 2,100 MU.)
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: Yes (A few historical records, more or less regular occurrences along the west coast the recent years, however, the spatial and temporal extent may vary significantly from one year to another.)
Individuals to contact: DAHL, Einar

Location & Date

[View larger map]
Location: Latitude: , Longitude:
General location information: ,
HAB Area code(s): NO-01 NO-02 NO-03 NO-04 NO-05 NO-06 NO-07 NO-08 NO-09 NO-10 NO-11 NO-12
Additional location information: Occurred almost all along the coast, but most numerous along the west coast. Toxins were only recorded at single stations along the west coast up to northern Norway.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: April-September.


Causative organism known: Yes
Causative Species/Genus: Alexandrium spp. ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
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:
In situ
Growth Comments Mainly due to in situ growth?
Additional Environmental information: No environmental information.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Saxitoxins 2,100 MU Bioassay-Mouse
Kit used: Type of kit used:
Additional information: Mouse Bioassay.
Economic losses:
Management decision: Harvesting was locally banned. The public was warned against picking toxic mussels.
Additional harmful effect information: Toxins recorded above the action level (400 MU/100g) according to mouse bioassay. 16,000 MU/100g were recorded at on the north-west coast in May, and 2,100 MU on a station in northern Norway in July. Most frequently levels were low 200-400 ME.
Updated at 04:21 on 2 Dec 2019