General Information

Event name: NO-88-001
Country: NORWAY
Nature of the harmful event:
Event directly affected:
Toxicity detected: No
Associated syndrome:
Unexplained toxicity:
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location: Yes (But in low concentrations only)
Individuals to contact: DAHL, Einar

Location & Date

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Location: Latitude: , Longitude:
General location information: Along the coast from the Swedish border to Haugesund at the west coast. and in the open Skagerrak,
HAB Area code(s): NO-01
Additional location information:
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: From the beginning of May to the beginning of June 1988


Causative organism known: Yes
Causative Species/Genus: Chrysochromulina polylepis ( 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: Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth Comments Probably a combination, mainly in situ growth in the eastern part of Skagerrak and more an advected population on the west coast of Norway.
Additional Environmental information: The bloom occurred in the surface of strongly stratified waters of relatively high temperature and low salinity during a period with bright and calm weather. The concentrations of nutrients were normal (relatively low), however, atomic N:P was high, from about 20 to more than hundred.

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: Towing of about 120 fish, farms from the west coast skerryguard into the large fiords to save the fish from exposure of algal water.
Additional harmful effect information: Severe mortalities among encaged fish, even wild fish and invertebrates liVing along the coast in the upper 10-15 m were killed. Also some seaweeds, mainly red algae were damaged during the bloom. Toxins were accumulated in mussels and harvesting was banned