General Information

Event name: NO-95-001
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 as since 1992.)
Individuals to contact: DAHL, Einar

Location & Date

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Location: Latitude: , Longitude:
General location information: South and innermost of Sodnefjord.,
HAB Area code(s): NO-09
Additional location information: Dinophysis spp. were recorded all along the Norwegian coast but most numerous along the south and in the innemost part of the Sognefjord at the west coast.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: In the period April-July toxin levels slightly above action level were recorde at some few stations along the coast. However, in general the problems in 1995 were minor.


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.
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 some evidence that the algae and toxin problems are spread by advection. But along the west coast the "hot spots" seems to be rather patchy which indicate local concentration of the algae and/or in situ growth.
Additional Environmental information: The problems 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: Control of shellfish toxicity by 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 according to mouse bioassay at one or another station from April-July.
Updated at 02:58 on 5 Mar 2018