General Information

Event name: NO-93-003
Country: NORWAY
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes
Associated syndrome: DSP
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 more dubious historical records. A yearly more or less large scale and long lasting phenomenon since 1984 according to mouse bioassay. The phenomenon was not so extensively monitored before 1992.)
Individuals to contact: DAHL, Einar , MARTINUSSEN, Ingrid

Location & Date

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Location: Latitude: , Longitude:
General location information: , NORWEGIAN COAST.
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 NO-13
Additional location information: Dinophysis spp. were recorded all along the Norwegian Coast, but most numerous along the South-west Coast.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: From March and throughout the year.


Causative organism known: Yes
Causative Species/Genus: Dinophysis spp. ( cells/L)
Most probably Dinophysis spp.
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Concentrations of some few hundred cells/l or more were recorded at some stations. In September-October even samll patches of reddish water due to mass occurrence of Dinophysis norvegica were seen along the South Coast of Norway.
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: Advected
In situ
Growth Comments Along the South Coast there are some evidence that algae and toxin problems are spread by advection. Along the West Coast the 'hot spots' seem to be rather patchy, which indicate local concentration of the algae and/or in situ growth.
Additional Environmental information: The problem occurred over a wide range of temperature and salinities.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information: Toxins recorded above the action level according to mouse bioassay at one or another station from March on.
Economic losses:
Management decision: Harvesting and consumption banned. Harvesting was locally banned. The public was warned against collecting toxic mussels.
Additional harmful effect information:
Updated at 04:12 on 2 Dec 2019