General Information

Event name: NO-94-005
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 has never been so extensively monitored since 1992.)
Individuals to contact: DAHL, Einar , TANGEN, Karl

Location & Date

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Location: Latitude: , Longitude:
General location information: Sognefjord., All along the Norwegian coast.
HAB Area code(s): NO-08
Additional location information: Dinophysis spp. were recorded all along the Norwegian coast but most numerous along the south and in the innermost part of the Sognefjord at the west coast.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: From March and throughout the year concentrations of some few hundred cells/L or more were recorded at one or another station. Among the Dinophysis spp. Occurring along the Norwegian coast, the species D. acuminata and D. acuta are considered as the most potent for toxicity. The latter has its main season in late summer and early autumn.


Causative organism known: Yes
Causative Species/Genus: Dinophysis acuta ( cells/L)
Dinophysis acuminata ( cells/L)
Dinophysis spp. ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Most probably Dinophysis spp., with D. acuminata and D. acuta as the most potent species. The latter has its main season in late summer and early autumn.
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 southern coast there are come evidence that the algae and toxin problems are spread by advection. But along the west coast the 'hot spots' seems to be rather patchy with indicate local concentration of the algae and/or in situ growth.
Additional Environmental information: The problem occur over a wide range of temperatures 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:
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 according to mouse bioassay at one or another station from March on. Most widespread in early autumn. Harvesting and consumption were banned.
Updated at 02:58 on 5 Mar 2018